1 /* 2 * Copyright (c) 1995 3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Bill Paul. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $Id: yp_main.c,v 1.14 1997/02/22 16:15:12 peter Exp $ 33 */ 34 35 /* 36 * ypserv startup function. 37 * We need out own main() since we have to do some additional work 38 * that rpcgen won't do for us. Most of this file was generated using 39 * rpcgen.new, and later modified. 40 */ 41 42 #include "yp.h" 43 #include <stdio.h> 44 #include <stdlib.h> /* getenv, exit */ 45 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 46 #include <string.h> /* strcmp */ 47 #include <signal.h> 48 #include <sys/ttycom.h> /* TIOCNOTTY */ 49 #ifdef __cplusplus 50 #include <sysent.h> /* getdtablesize, open */ 51 #endif /* __cplusplus */ 52 #include <memory.h> 53 #include <sys/socket.h> 54 #include <netinet/in.h> 55 #include <syslog.h> 56 #include <sys/wait.h> 57 #include "yp_extern.h" 58 #include <unistd.h> 59 #include <rpc/rpc.h> 60 #include <errno.h> 61 #include <err.h> 62 63 #ifndef SIG_PF 64 #define SIG_PF void(*)(int) 65 #endif 66 67 #define _RPCSVC_CLOSEDOWN 120 68 #ifndef lint 69 static const char rcsid[] = "$Id: yp_main.c,v 1.14 1997/02/22 16:15:12 peter Exp $"; 70 #endif /* not lint */ 71 int _rpcpmstart; /* Started by a port monitor ? */ 72 static int _rpcfdtype; 73 /* Whether Stream or Datagram ? */ 74 /* States a server can be in wrt request */ 75 76 #define _IDLE 0 77 #define _SERVED 1 78 #define _SERVING 2 79 80 extern void ypprog_1 __P((struct svc_req *, register SVCXPRT *)); 81 extern void ypprog_2 __P((struct svc_req *, register SVCXPRT *)); 82 extern int _rpc_dtablesize __P((void)); 83 extern int _rpcsvcstate; /* Set when a request is serviced */ 84 char *progname = "ypserv"; 85 char *yp_dir = _PATH_YP; 86 int debug = 0; 87 int do_dns = 0; 88 int resfd; 89 90 static 91 void _msgout(char* msg) 92 { 93 if (debug) { 94 if (_rpcpmstart) 95 syslog(LOG_ERR, msg); 96 else 97 (void) fprintf(stderr, "%s\n", msg); 98 } else 99 syslog(LOG_ERR, msg); 100 } 101 102 static void 103 yp_svc_run() 104 { 105 #ifdef FD_SETSIZE 106 fd_set readfds; 107 #else 108 int readfds; 109 #endif /* def FD_SETSIZE */ 110 extern int forked; 111 int pid; 112 int fd_setsize = _rpc_dtablesize(); 113 struct timeval timeout; 114 115 /* Establish the identity of the parent ypserv process. */ 116 pid = getpid(); 117 118 for (;;) { 119 #ifdef FD_SETSIZE 120 readfds = svc_fdset; 121 #else 122 readfds = svc_fds; 123 #endif /* def FD_SETSIZE */ 124 125 FD_SET(resfd, &readfds); 126 127 timeout.tv_sec = RESOLVER_TIMEOUT; 128 timeout.tv_usec = 0; 129 switch (select(fd_setsize, &readfds, NULL, NULL, 130 &timeout)) { 131 case -1: 132 if (errno == EINTR) { 133 continue; 134 } 135 perror("svc_run: - select failed"); 136 return; 137 case 0: 138 yp_prune_dnsq(); 139 break; 140 default: 141 if (FD_ISSET(resfd, &readfds)) { 142 yp_run_dnsq(); 143 FD_CLR(resfd, &readfds); 144 } 145 svc_getreqset(&readfds); 146 if (forked && pid != getpid()) 147 exit(0); 148 } 149 } 150 } 151 152 static void unregister() 153 { 154 (void) pmap_unset(YPPROG, YPVERS); 155 (void) pmap_unset(YPPROG, YPOLDVERS); 156 } 157 158 static void reaper(sig) 159 int sig; 160 { 161 int status; 162 163 if (sig == SIGHUP) { 164 load_securenets(); 165 #ifdef DB_CACHE 166 yp_flush_all(); 167 #endif 168 return; 169 } 170 171 if (sig == SIGCHLD) { 172 while (wait3(&status, WNOHANG, NULL) > 0) 173 children--; 174 } else { 175 unregister(); 176 exit(0); 177 } 178 } 179 180 static void usage() 181 { 182 fprintf(stderr, "Usage: %s [-h] [-d] [-n] [-p path]\n", progname); 183 exit(1); 184 } 185 186 static void 187 closedown(int sig) 188 { 189 if (_rpcsvcstate == _IDLE) { 190 extern fd_set svc_fdset; 191 static int size; 192 int i, openfd; 193 194 if (_rpcfdtype == SOCK_DGRAM) { 195 unregister(); 196 exit(0); 197 } 198 if (size == 0) { 199 size = getdtablesize(); 200 } 201 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 202 if (FD_ISSET(i, &svc_fdset)) 203 openfd++; 204 if (openfd <= 1) { 205 unregister(); 206 exit(0); 207 } 208 } 209 if (_rpcsvcstate == _SERVED) 210 _rpcsvcstate = _IDLE; 211 212 (void) signal(SIGALRM, (SIG_PF) closedown); 213 (void) alarm(_RPCSVC_CLOSEDOWN/2); 214 } 215 216 main(argc, argv) 217 int argc; 218 char *argv[]; 219 { 220 register SVCXPRT *transp = NULL; 221 int sock; 222 int proto = 0; 223 struct sockaddr_in saddr; 224 int asize = sizeof (saddr); 225 int ch; 226 227 while ((ch = getopt(argc, argv, "hdnp:")) != -1) { 228 switch(ch) { 229 case 'd': 230 debug = ypdb_debug = 1; 231 break; 232 case 'n': 233 do_dns = 1; 234 break; 235 case 'p': 236 yp_dir = optarg; 237 break; 238 case 'h': 239 default: 240 usage(); 241 } 242 } 243 244 load_securenets(); 245 yp_init_resolver(); 246 #ifdef DB_CACHE 247 yp_init_dbs(); 248 #endif 249 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 250 int ssize = sizeof (int); 251 252 if (saddr.sin_family != AF_INET) 253 exit(1); 254 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 255 (char *)&_rpcfdtype, &ssize) == -1) 256 exit(1); 257 sock = 0; 258 _rpcpmstart = 1; 259 proto = 0; 260 openlog(progname, LOG_PID, LOG_DAEMON); 261 } else { 262 if (!debug) { 263 if (daemon(0,0)) { 264 err(1,"cannot fork"); 265 } 266 openlog(progname, LOG_PID, LOG_DAEMON); 267 } 268 sock = RPC_ANYSOCK; 269 (void) pmap_unset(YPPROG, YPVERS); 270 (void) pmap_unset(YPPROG, 1); 271 } 272 273 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 274 transp = svcudp_create(sock); 275 if (transp == NULL) { 276 _msgout("cannot create udp service."); 277 exit(1); 278 } 279 if (!_rpcpmstart) 280 proto = IPPROTO_UDP; 281 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 282 _msgout("unable to register (YPPROG, YPOLDVERS, udp)."); 283 exit(1); 284 } 285 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 286 _msgout("unable to register (YPPROG, YPVERS, udp)."); 287 exit(1); 288 } 289 } 290 291 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 292 transp = svctcp_create(sock, 0, 0); 293 if (transp == NULL) { 294 _msgout("cannot create tcp service."); 295 exit(1); 296 } 297 if (!_rpcpmstart) 298 proto = IPPROTO_TCP; 299 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 300 _msgout("unable to register (YPPROG, YPOLDVERS, tcp)."); 301 exit(1); 302 } 303 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 304 _msgout("unable to register (YPPROG, YPVERS, tcp)."); 305 exit(1); 306 } 307 } 308 309 if (transp == (SVCXPRT *)NULL) { 310 _msgout("could not create a handle"); 311 exit(1); 312 } 313 if (_rpcpmstart) { 314 (void) signal(SIGALRM, (SIG_PF) closedown); 315 (void) alarm(_RPCSVC_CLOSEDOWN/2); 316 } 317 /* 318 * Make sure SIGPIPE doesn't blow us away while servicing TCP 319 * connections. 320 */ 321 (void) signal(SIGPIPE, SIG_IGN); 322 (void) signal(SIGCHLD, (SIG_PF) reaper); 323 (void) signal(SIGTERM, (SIG_PF) reaper); 324 (void) signal(SIGINT, (SIG_PF) reaper); 325 (void) signal(SIGHUP, (SIG_PF) reaper); 326 yp_svc_run(); 327 _msgout("svc_run returned"); 328 exit(1); 329 /* NOTREACHED */ 330 } 331