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 * $FreeBSD: src/usr.sbin/ypserv/yp_main.c,v 1.29 2008/02/03 17:39:37 matteo Exp $ 33 * $DragonFly: src/usr.sbin/ypserv/yp_main.c,v 1.5 2005/11/24 22:23:02 swildner Exp $ 34 */ 35 36 /* 37 * ypserv startup function. 38 * We need out own main() since we have to do some additional work 39 * that rpcgen won't do for us. Most of this file was generated using 40 * rpcgen.new, and later modified. 41 */ 42 43 #include "yp.h" 44 #include <err.h> 45 #include <errno.h> 46 #include <memory.h> 47 #include <stdio.h> 48 #include <signal.h> 49 #include <stdlib.h> /* getenv, exit */ 50 #include <string.h> /* strcmp */ 51 #include <syslog.h> 52 #include <unistd.h> 53 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 54 #ifdef __cplusplus 55 #include <sysent.h> /* getdtablesize, open */ 56 #endif /* __cplusplus */ 57 #include <sys/socket.h> 58 #include <netinet/in.h> 59 #include <sys/wait.h> 60 #include "yp_extern.h" 61 #include <rpc/rpc.h> 62 63 #ifndef SIG_PF 64 #define SIG_PF void(*)(int) 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 void ypprog_1(struct svc_req *, SVCXPRT *); 78 extern void ypprog_2(struct svc_req *, SVCXPRT *); 79 extern int _rpc_dtablesize(void); 80 extern int _rpcsvcstate; /* Set when a request is serviced */ 81 char *progname = "ypserv"; 82 const char *yp_dir = _PATH_YP; 83 /*int debug = 0;*/ 84 int do_dns = 0; 85 int resfd; 86 87 struct socktype { 88 const char *st_name; 89 int st_type; 90 }; 91 static struct socktype stlist[] = { 92 { "tcp", SOCK_STREAM }, 93 { "udp", SOCK_DGRAM }, 94 { NULL, 0 } 95 }; 96 97 static void 98 _msgout(char *msg) 99 { 100 if (debug) { 101 if (_rpcpmstart) 102 syslog(LOG_ERR, "%s", msg); 103 else 104 warnx("%s", msg); 105 } else 106 syslog(LOG_ERR, "%s", msg); 107 } 108 109 pid_t yp_pid; 110 111 static void 112 yp_svc_run(void) 113 { 114 #ifdef FD_SETSIZE 115 fd_set readfds; 116 #else 117 int readfds; 118 #endif /* def FD_SETSIZE */ 119 int fd_setsize = _rpc_dtablesize(); 120 struct timeval timeout; 121 122 /* Establish the identity of the parent ypserv process. */ 123 yp_pid = getpid(); 124 125 for (;;) { 126 #ifdef FD_SETSIZE 127 readfds = svc_fdset; 128 #else 129 readfds = svc_fds; 130 #endif /* def FD_SETSIZE */ 131 132 FD_SET(resfd, &readfds); 133 134 timeout.tv_sec = RESOLVER_TIMEOUT; 135 timeout.tv_usec = 0; 136 switch (select(fd_setsize, &readfds, NULL, NULL, 137 &timeout)) { 138 case -1: 139 if (errno == EINTR) { 140 continue; 141 } 142 warn("svc_run: - select failed"); 143 return; 144 case 0: 145 if (getpid() == yp_pid) 146 yp_prune_dnsq(); 147 break; 148 default: 149 if (getpid() == yp_pid) { 150 if (FD_ISSET(resfd, &readfds)) { 151 yp_run_dnsq(); 152 FD_CLR(resfd, &readfds); 153 } 154 svc_getreqset(&readfds); 155 } 156 } 157 if (yp_pid != getpid()) 158 _exit(0); 159 } 160 } 161 162 static void 163 unregister(void) 164 { 165 pmap_unset(YPPROG, YPVERS); 166 pmap_unset(YPPROG, YPOLDVERS); 167 } 168 169 static void 170 reaper(int sig) 171 { 172 int status; 173 int saved_errno; 174 175 saved_errno = errno; 176 177 if (sig == SIGHUP) { 178 load_securenets(); 179 #ifdef DB_CACHE 180 yp_flush_all(); 181 #endif 182 errno = saved_errno; 183 return; 184 } 185 186 if (sig == SIGCHLD) { 187 while (wait3(&status, WNOHANG, NULL) > 0) 188 children--; 189 } else { 190 unregister(); 191 exit(0); 192 } 193 errno = saved_errno; 194 return; 195 } 196 197 static void 198 usage(void) 199 { 200 fprintf(stderr, "usage: ypserv [-h] [-d] [-n] [-p path] [-P port]\n"); 201 exit(1); 202 } 203 204 static void 205 closedown(int sig) 206 { 207 if (_rpcsvcstate == _IDLE) { 208 extern fd_set svc_fdset; 209 static int size; 210 int i, openfd; 211 212 if (_rpcfdtype == SOCK_DGRAM) { 213 unregister(); 214 exit(0); 215 } 216 if (size == 0) { 217 size = getdtablesize(); 218 } 219 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 220 if (FD_ISSET(i, &svc_fdset)) 221 openfd++; 222 if (openfd <= 1) { 223 unregister(); 224 exit(0); 225 } 226 } 227 if (_rpcsvcstate == _SERVED) 228 _rpcsvcstate = _IDLE; 229 230 signal(SIGALRM, (SIG_PF)closedown); 231 alarm(_RPCSVC_CLOSEDOWN / 2); 232 } 233 234 int 235 main(int argc, char **argv) 236 { 237 SVCXPRT *transp = NULL; 238 int sock; 239 int proto = 0; 240 struct sockaddr_in saddr; 241 socklen_t asize = sizeof (saddr); 242 int ch; 243 in_port_t yp_port = 0; 244 char *errstr; 245 struct socktype *st; 246 247 while ((ch = getopt(argc, argv, "hdnp:P:")) != -1) { 248 switch (ch) { 249 case 'd': 250 debug = ypdb_debug = 1; 251 break; 252 case 'n': 253 do_dns = 1; 254 break; 255 case 'p': 256 yp_dir = optarg; 257 break; 258 case 'P': 259 yp_port = (in_port_t)strtonum(optarg, 1, 65535, 260 (const char **)&errstr); 261 if (yp_port == 0 && errstr != NULL) { 262 _msgout("invalid port number provided"); 263 exit(1); 264 } 265 break; 266 case 'h': 267 default: 268 usage(); 269 } 270 } 271 272 load_securenets(); 273 yp_init_resolver(); 274 #ifdef DB_CACHE 275 yp_init_dbs(); 276 #endif 277 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 278 int ssize = sizeof (int); 279 280 if (saddr.sin_family != AF_INET) 281 exit(1); 282 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 283 (char *)&_rpcfdtype, &ssize) == -1) 284 exit(1); 285 sock = 0; 286 _rpcpmstart = 1; 287 proto = 0; 288 openlog("ypserv", LOG_PID, LOG_DAEMON); 289 } else { 290 if (!debug) { 291 if (daemon(0,0)) { 292 err(1,"cannot fork"); 293 } 294 openlog("ypserv", LOG_PID, LOG_DAEMON); 295 } 296 sock = RPC_ANYSOCK; 297 pmap_unset(YPPROG, YPVERS); 298 pmap_unset(YPPROG, 1); 299 } 300 301 /* 302 * Initialize TCP/UDP sockets. 303 */ 304 memset((char *)&saddr, 0, sizeof(saddr)); 305 saddr.sin_family = AF_INET; 306 saddr.sin_addr.s_addr = htonl(INADDR_ANY); 307 saddr.sin_port = htons(yp_port); 308 for (st = stlist; st->st_name != NULL; st++) { 309 /* Do not bind the socket if the user didn't specify a port */ 310 if (yp_port == 0) 311 break; 312 313 sock = socket(AF_INET, st->st_type, 0); 314 if (sock == -1) { 315 if ((asprintf(&errstr, "cannot create a %s socket", 316 st->st_name)) == -1) 317 err(1, "unexpected failure in asprintf()"); 318 _msgout(errstr); 319 free((void *)errstr); 320 exit(1); 321 } 322 if (bind(sock, (struct sockaddr *) &saddr, sizeof(saddr)) 323 == -1) { 324 if ((asprintf(&errstr, "cannot bind %s socket", 325 st->st_name)) == -1) 326 err(1, "unexpected failure in asprintf()"); 327 _msgout(errstr); 328 free((void *)errstr); 329 exit(1); 330 } 331 errstr = NULL; 332 } 333 334 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 335 transp = svcudp_create(sock); 336 if (transp == NULL) { 337 _msgout("cannot create udp service"); 338 exit(1); 339 } 340 if (!_rpcpmstart) 341 proto = IPPROTO_UDP; 342 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 343 _msgout("unable to register (YPPROG, YPOLDVERS, udp)"); 344 exit(1); 345 } 346 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 347 _msgout("unable to register (YPPROG, YPVERS, udp)"); 348 exit(1); 349 } 350 } 351 352 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 353 transp = svctcp_create(sock, 0, 0); 354 if (transp == NULL) { 355 _msgout("cannot create tcp service"); 356 exit(1); 357 } 358 if (!_rpcpmstart) 359 proto = IPPROTO_TCP; 360 if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { 361 _msgout("unable to register (YPPROG, YPOLDVERS, tcp)"); 362 exit(1); 363 } 364 if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { 365 _msgout("unable to register (YPPROG, YPVERS, tcp)"); 366 exit(1); 367 } 368 } 369 370 if (transp == NULL) { 371 _msgout("could not create a handle"); 372 exit(1); 373 } 374 if (_rpcpmstart) { 375 signal(SIGALRM, (SIG_PF)closedown); 376 alarm(_RPCSVC_CLOSEDOWN / 2); 377 } 378 /* 379 * Make sure SIGPIPE doesn't blow us away while servicing TCP 380 * connections. 381 */ 382 signal(SIGPIPE, SIG_IGN); 383 signal(SIGCHLD, (SIG_PF) reaper); 384 signal(SIGTERM, (SIG_PF) reaper); 385 signal(SIGINT, (SIG_PF) reaper); 386 signal(SIGHUP, (SIG_PF) reaper); 387 yp_svc_run(); 388 _msgout("svc_run returned"); 389 exit(1); 390 /* NOTREACHED */ 391 } 392