yp_main.c revision 30827
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 33#ifndef lint 34static const char rcsid[] = 35 "$Id$"; 36#endif /* not lint */ 37 38/* 39 * ypserv startup function. 40 * We need out own main() since we have to do some additional work 41 * that rpcgen won't do for us. Most of this file was generated using 42 * rpcgen.new, and later modified. 43 */ 44 45#include "yp.h" 46#include <err.h> 47#include <errno.h> 48#include <memory.h> 49#include <stdio.h> 50#include <signal.h> 51#include <stdlib.h> /* getenv, exit */ 52#include <string.h> /* strcmp */ 53#include <syslog.h> 54#include <unistd.h> 55#include <rpc/pmap_clnt.h> /* for pmap_unset */ 56#include <sys/ttycom.h> /* TIOCNOTTY */ 57#ifdef __cplusplus 58#include <sysent.h> /* getdtablesize, open */ 59#endif /* __cplusplus */ 60#include <sys/socket.h> 61#include <netinet/in.h> 62#include <sys/wait.h> 63#include "yp_extern.h" 64#include <rpc/rpc.h> 65 66#ifndef SIG_PF 67#define SIG_PF void(*)(int) 68#endif 69 70#define _RPCSVC_CLOSEDOWN 120 71int _rpcpmstart; /* Started by a port monitor ? */ 72static 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 80extern void ypprog_1 __P((struct svc_req *, register SVCXPRT *)); 81extern void ypprog_2 __P((struct svc_req *, register SVCXPRT *)); 82extern int _rpc_dtablesize __P((void)); 83extern int _rpcsvcstate; /* Set when a request is serviced */ 84char *progname = "ypserv"; 85char *yp_dir = _PATH_YP; 86int debug = 0; 87int do_dns = 0; 88int resfd; 89 90static 91void _msgout(char* msg) 92{ 93 if (debug) { 94 if (_rpcpmstart) 95 syslog(LOG_ERR, msg); 96 else 97 warnx("%s", msg); 98 } else 99 syslog(LOG_ERR, msg); 100} 101 102static void 103yp_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 warn("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 152static void unregister() 153{ 154 (void) pmap_unset(YPPROG, YPVERS); 155 (void) pmap_unset(YPPROG, YPOLDVERS); 156} 157 158static 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 180static void usage() 181{ 182 fprintf(stderr, "usage: ypserv [-h] [-d] [-n] [-p path]\n"); 183 exit(1); 184} 185 186static void 187closedown(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 216int 217main(argc, argv) 218 int argc; 219 char *argv[]; 220{ 221 register SVCXPRT *transp = NULL; 222 int sock; 223 int proto = 0; 224 struct sockaddr_in saddr; 225 int asize = sizeof (saddr); 226 int ch; 227 228 while ((ch = getopt(argc, argv, "hdnp:")) != -1) { 229 switch(ch) { 230 case 'd': 231 debug = ypdb_debug = 1; 232 break; 233 case 'n': 234 do_dns = 1; 235 break; 236 case 'p': 237 yp_dir = optarg; 238 break; 239 case 'h': 240 default: 241 usage(); 242 } 243 } 244 245 load_securenets(); 246 yp_init_resolver(); 247#ifdef DB_CACHE 248 yp_init_dbs(); 249#endif 250 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 251 int ssize = sizeof (int); 252 253 if (saddr.sin_family != AF_INET) 254 exit(1); 255 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 256 (char *)&_rpcfdtype, &ssize) == -1) 257 exit(1); 258 sock = 0; 259 _rpcpmstart = 1; 260 proto = 0; 261 openlog("ypserv", LOG_PID, LOG_DAEMON); 262 } else { 263 if (!debug) { 264 if (daemon(0,0)) { 265 err(1,"cannot fork"); 266 } 267 openlog("ypserv", LOG_PID, LOG_DAEMON); 268 } 269 sock = RPC_ANYSOCK; 270 (void) pmap_unset(YPPROG, YPVERS); 271 (void) pmap_unset(YPPROG, 1); 272 } 273 274 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 275 transp = svcudp_create(sock); 276 if (transp == NULL) { 277 _msgout("cannot create udp service"); 278 exit(1); 279 } 280 if (!_rpcpmstart) 281 proto = IPPROTO_UDP; 282 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 283 _msgout("unable to register (YPPROG, YPOLDVERS, udp)"); 284 exit(1); 285 } 286 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 287 _msgout("unable to register (YPPROG, YPVERS, udp)"); 288 exit(1); 289 } 290 } 291 292 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 293 transp = svctcp_create(sock, 0, 0); 294 if (transp == NULL) { 295 _msgout("cannot create tcp service"); 296 exit(1); 297 } 298 if (!_rpcpmstart) 299 proto = IPPROTO_TCP; 300 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 301 _msgout("unable to register (YPPROG, YPOLDVERS, tcp)"); 302 exit(1); 303 } 304 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 305 _msgout("unable to register (YPPROG, YPVERS, tcp)"); 306 exit(1); 307 } 308 } 309 310 if (transp == (SVCXPRT *)NULL) { 311 _msgout("could not create a handle"); 312 exit(1); 313 } 314 if (_rpcpmstart) { 315 (void) signal(SIGALRM, (SIG_PF) closedown); 316 (void) alarm(_RPCSVC_CLOSEDOWN/2); 317 } 318/* 319 * Make sure SIGPIPE doesn't blow us away while servicing TCP 320 * connections. 321 */ 322 (void) signal(SIGPIPE, SIG_IGN); 323 (void) signal(SIGCHLD, (SIG_PF) reaper); 324 (void) signal(SIGTERM, (SIG_PF) reaper); 325 (void) signal(SIGINT, (SIG_PF) reaper); 326 (void) signal(SIGHUP, (SIG_PF) reaper); 327 yp_svc_run(); 328 _msgout("svc_run returned"); 329 exit(1); 330 /* NOTREACHED */ 331} 332