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 #include "ypupdate_prot.h" 37 #include <stdio.h> 38 #include <stdlib.h> /* getenv, exit */ 39 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 40 #include <rpc/rpc_com.h> 41 #include <string.h> /* strcmp */ 42 #include <signal.h> 43 #ifdef __cplusplus 44 #include <sysent.h> /* getdtablesize, open */ 45 #endif /* __cplusplus */ 46 #include <memory.h> 47 #include <sys/socket.h> 48 #include <netinet/in.h> 49 #include <syslog.h> 50 #include <sys/wait.h> 51 #include <errno.h> 52 #include <err.h> 53 #include <unistd.h> 54 #include "ypupdated_extern.h" 55 #include "yp_extern.h" 56 57 #ifndef SIG_PF 58 #define SIG_PF void(*)(int) 59 #endif 60 61 #ifdef DEBUG 62 #define RPC_SVC_FG 63 #endif 64 65 #define _RPCSVC_CLOSEDOWN 120 66 int _rpcpmstart; /* Started by a port monitor ? */ 67 static int _rpcfdtype; 68 /* Whether Stream or Datagram ? */ 69 /* States a server can be in wrt request */ 70 71 #define _IDLE 0 72 #define _SERVED 1 73 #define _SERVING 2 74 75 extern int _rpcsvcstate; /* Set when a request is serviced */ 76 77 int debug; 78 79 char *progname = "rpc.ypupdated"; 80 char *yp_dir = "/var/yp/"; 81 82 static void 83 _msgout(char* msg) 84 { 85 #ifdef RPC_SVC_FG 86 if (_rpcpmstart) 87 syslog(LOG_ERR, "%s", msg); 88 else 89 warnx("%s", msg); 90 #else 91 syslog(LOG_ERR, "%s", msg); 92 #endif 93 } 94 95 static void 96 closedown(int sig) 97 { 98 if (_rpcsvcstate == _IDLE) { 99 extern fd_set svc_fdset; 100 static int size; 101 int i, openfd; 102 103 if (_rpcfdtype == SOCK_DGRAM) 104 exit(0); 105 if (size == 0) { 106 size = getdtablesize(); 107 } 108 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 109 if (FD_ISSET(i, &svc_fdset)) 110 openfd++; 111 if (openfd <= 1) 112 exit(0); 113 } 114 if (_rpcsvcstate == _SERVED) 115 _rpcsvcstate = _IDLE; 116 117 (void) signal(SIGALRM, (SIG_PF) closedown); 118 (void) alarm(_RPCSVC_CLOSEDOWN/2); 119 } 120 121 static void 122 ypupdated_svc_run(void) 123 { 124 #ifdef FD_SETSIZE 125 fd_set readfds; 126 #else 127 int readfds; 128 #endif /* def FD_SETSIZE */ 129 extern int forked; 130 int pid; 131 int fd_setsize = _rpc_dtablesize(); 132 133 /* Establish the identity of the parent ypupdated process. */ 134 pid = getpid(); 135 136 for (;;) { 137 #ifdef FD_SETSIZE 138 readfds = svc_fdset; 139 #else 140 readfds = svc_fds; 141 #endif /* def FD_SETSIZE */ 142 switch (select(fd_setsize, &readfds, NULL, NULL, 143 (struct timeval *)0)) { 144 case -1: 145 if (errno == EINTR) { 146 continue; 147 } 148 warn("svc_run: - select failed"); 149 return; 150 case 0: 151 continue; 152 default: 153 svc_getreqset(&readfds); 154 if (forked && pid != getpid()) 155 exit(0); 156 } 157 } 158 } 159 160 static void 161 reaper(int sig) 162 { 163 int status; 164 165 if (sig == SIGHUP) { 166 #ifdef foo 167 load_securenets(); 168 #endif 169 return; 170 } 171 172 if (sig == SIGCHLD) { 173 while (wait3(&status, WNOHANG, NULL) > 0) 174 children--; 175 } else { 176 (void) pmap_unset(YPU_PROG, YPU_VERS); 177 exit(0); 178 } 179 } 180 181 void 182 usage(void) 183 { 184 fprintf(stderr, "rpc.ypupdatedd [-p path]\n"); 185 exit(0); 186 } 187 188 int 189 main(int argc, char *argv[]) 190 { 191 register SVCXPRT *transp = NULL; 192 int sock; 193 int proto = 0; 194 struct sockaddr_in saddr; 195 int asize = sizeof (saddr); 196 int ch; 197 198 while ((ch = getopt(argc, argv, "p:h")) != -1) { 199 switch (ch) { 200 case 'p': 201 yp_dir = optarg; 202 break; 203 default: 204 usage(); 205 break; 206 } 207 } 208 #ifdef foo 209 load_securenets(); 210 #endif 211 212 if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) { 213 yp_error("failed to register AUTH_DES flavor"); 214 exit(1); 215 } 216 217 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 218 int ssize = sizeof (int); 219 220 if (saddr.sin_family != AF_INET) 221 exit(1); 222 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 223 (char *)&_rpcfdtype, &ssize) == -1) 224 exit(1); 225 sock = 0; 226 _rpcpmstart = 1; 227 proto = 0; 228 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON); 229 } else { 230 #ifndef RPC_SVC_FG 231 if (daemon(0,0)) { 232 err(1, "cannot fork"); 233 } 234 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON); 235 #endif 236 sock = RPC_ANYSOCK; 237 (void) pmap_unset(YPU_PROG, YPU_VERS); 238 } 239 240 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 241 transp = svcudp_create(sock); 242 if (transp == NULL) { 243 _msgout("cannot create udp service."); 244 exit(1); 245 } 246 if (!_rpcpmstart) 247 proto = IPPROTO_UDP; 248 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 249 _msgout("unable to register (YPU_PROG, YPU_VERS, udp)."); 250 exit(1); 251 } 252 } 253 254 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 255 transp = svctcp_create(sock, 0, 0); 256 if (transp == NULL) { 257 _msgout("cannot create tcp service."); 258 exit(1); 259 } 260 if (!_rpcpmstart) 261 proto = IPPROTO_TCP; 262 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 263 _msgout("unable to register (YPU_PROG, YPU_VERS, tcp)."); 264 exit(1); 265 } 266 } 267 268 if (transp == (SVCXPRT *)NULL) { 269 _msgout("could not create a handle"); 270 exit(1); 271 } 272 if (_rpcpmstart) { 273 (void) signal(SIGALRM, (SIG_PF) closedown); 274 (void) alarm(_RPCSVC_CLOSEDOWN/2); 275 } 276 277 (void) signal(SIGPIPE, SIG_IGN); 278 (void) signal(SIGCHLD, (SIG_PF) reaper); 279 (void) signal(SIGTERM, (SIG_PF) reaper); 280 (void) signal(SIGINT, (SIG_PF) reaper); 281 (void) signal(SIGHUP, (SIG_PF) reaper); 282 283 ypupdated_svc_run(); 284 _msgout("svc_run returned"); 285 exit(1); 286 /* NOTREACHED */ 287 } 288