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 1.3 1996/05/01 02:39:34 wpaul Exp wpaul $ 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 1.3 1996/05/01 02:39:34 wpaul Exp wpaul $"; 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 89 static 90 void _msgout(char* msg) 91 { 92 if (debug) { 93 if (_rpcpmstart) 94 syslog(LOG_ERR, msg); 95 else 96 (void) fprintf(stderr, "%s\n", msg); 97 } else 98 syslog(LOG_ERR, msg); 99 } 100 101 static void 102 yp_svc_run() 103 { 104 #ifdef FD_SETSIZE 105 fd_set readfds; 106 #else 107 int readfds; 108 #endif /* def FD_SETSIZE */ 109 extern int forked; 110 int pid; 111 int fd_setsize = _rpc_dtablesize(); 112 113 /* Establish the identity of the parent ypserv process. */ 114 pid = getpid(); 115 116 for (;;) { 117 #ifdef FD_SETSIZE 118 readfds = svc_fdset; 119 #else 120 readfds = svc_fds; 121 #endif /* def FD_SETSIZE */ 122 switch (select(fd_setsize, &readfds, NULL, NULL, 123 (struct timeval *)0)) { 124 case -1: 125 if (errno == EINTR) { 126 continue; 127 } 128 perror("svc_run: - select failed"); 129 return; 130 case 0: 131 continue; 132 default: 133 svc_getreqset(&readfds); 134 if (forked && pid != getpid()) 135 exit(0); 136 } 137 } 138 } 139 140 static void unregister() 141 { 142 (void) pmap_unset(YPPROG, YPVERS); 143 (void) pmap_unset(YPPROG, YPOLDVERS); 144 } 145 146 static void reaper(sig) 147 int sig; 148 { 149 int status; 150 151 if (sig == SIGHUP) { 152 load_securenets(); 153 #ifdef DB_CACHE 154 yp_flush_all(); 155 #endif 156 return; 157 } 158 159 if (sig == SIGCHLD) { 160 while (wait3(&status, WNOHANG, NULL) > 0) 161 children--; 162 } else { 163 unregister(); 164 exit(0); 165 } 166 } 167 168 static void usage() 169 { 170 fprintf(stderr, "Usage: %s [-h] [-d] [-n] [-p path]\n", progname); 171 exit(1); 172 } 173 174 static void 175 closedown(int sig) 176 { 177 if (_rpcsvcstate == _IDLE) { 178 extern fd_set svc_fdset; 179 static int size; 180 int i, openfd; 181 182 if (_rpcfdtype == SOCK_DGRAM) { 183 unregister(); 184 exit(0); 185 } 186 if (size == 0) { 187 size = getdtablesize(); 188 } 189 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 190 if (FD_ISSET(i, &svc_fdset)) 191 openfd++; 192 if (openfd <= 1) { 193 unregister(); 194 exit(0); 195 } 196 } 197 if (_rpcsvcstate == _SERVED) 198 _rpcsvcstate = _IDLE; 199 200 (void) signal(SIGALRM, (SIG_PF) closedown); 201 (void) alarm(_RPCSVC_CLOSEDOWN/2); 202 } 203 204 main(argc, argv) 205 int argc; 206 char *argv[]; 207 { 208 register SVCXPRT *transp = NULL; 209 int sock; 210 int proto = 0; 211 struct sockaddr_in saddr; 212 int asize = sizeof (saddr); 213 int ch; 214 215 while ((ch = getopt(argc, argv, "hdnp:")) != EOF) { 216 switch(ch) { 217 case 'd': 218 debug = ypdb_debug = 1; 219 break; 220 case 'n': 221 do_dns = 1; 222 break; 223 case 'p': 224 yp_dir = optarg; 225 break; 226 case 'h': 227 default: 228 usage(); 229 } 230 } 231 232 load_securenets(); 233 #ifdef DB_CACHE 234 yp_init_dbs(); 235 #endif 236 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 237 int ssize = sizeof (int); 238 239 if (saddr.sin_family != AF_INET) 240 exit(1); 241 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 242 (char *)&_rpcfdtype, &ssize) == -1) 243 exit(1); 244 sock = 0; 245 _rpcpmstart = 1; 246 proto = 0; 247 openlog(progname, LOG_PID, LOG_DAEMON); 248 } else { 249 if (!debug) { 250 if (daemon(0,0)) { 251 err(1,"cannot fork"); 252 } 253 openlog(progname, LOG_PID, LOG_DAEMON); 254 } 255 sock = RPC_ANYSOCK; 256 (void) pmap_unset(YPPROG, YPVERS); 257 (void) pmap_unset(YPPROG, 1); 258 } 259 260 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 261 transp = svcudp_create(sock); 262 if (transp == NULL) { 263 _msgout("cannot create udp service."); 264 exit(1); 265 } 266 if (!_rpcpmstart) 267 proto = IPPROTO_UDP; 268 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 269 _msgout("unable to register (YPPROG, YPOLDVERS, udp)."); 270 exit(1); 271 } 272 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 273 _msgout("unable to register (YPPROG, YPVERS, udp)."); 274 exit(1); 275 } 276 } 277 278 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 279 transp = svctcp_create(sock, 0, 0); 280 if (transp == NULL) { 281 _msgout("cannot create tcp service."); 282 exit(1); 283 } 284 if (!_rpcpmstart) 285 proto = IPPROTO_TCP; 286 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 287 _msgout("unable to register (YPPROG, YPOLDVERS, tcp)."); 288 exit(1); 289 } 290 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 291 _msgout("unable to register (YPPROG, YPVERS, tcp)."); 292 exit(1); 293 } 294 } 295 296 if (transp == (SVCXPRT *)NULL) { 297 _msgout("could not create a handle"); 298 exit(1); 299 } 300 if (_rpcpmstart) { 301 (void) signal(SIGALRM, (SIG_PF) closedown); 302 (void) alarm(_RPCSVC_CLOSEDOWN/2); 303 } 304 /* 305 * Make sure SIGPIPE doesn't blow us away while servicing TCP 306 * connections. 307 */ 308 (void) signal(SIGPIPE, SIG_IGN); 309 (void) signal(SIGCHLD, (SIG_PF) reaper); 310 (void) signal(SIGTERM, (SIG_PF) reaper); 311 (void) signal(SIGINT, (SIG_PF) reaper); 312 (void) signal(SIGHUP, (SIG_PF) reaper); 313 yp_svc_run(); 314 _msgout("svc_run returned"); 315 exit(1); 316 /* NOTREACHED */ 317 } 318