| 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 1.21.2.3 2002/02/15 00:47:00 des Exp $ |
| 33 | * $DragonFly: src/usr.sbin/ypserv/yp_main.c,v 1.4 2004/12/18 22:48:15 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 | char *yp_dir = _PATH_YP; |
| 83 | /*int debug = 0;*/ |
| 84 | int do_dns = 0; |
| 85 | int resfd; |
| 86 | |
| 87 | static void |
| 88 | _msgout(char *msg) |
| 89 | { |
| 90 | if (debug) { |
| 91 | if (_rpcpmstart) |
| 92 | syslog(LOG_ERR, "%s", msg); |
| 93 | else |
| 94 | warnx("%s", msg); |
| 95 | } else |
| 96 | syslog(LOG_ERR, "%s", msg); |
| 97 | } |
| 98 | |
| 99 | pid_t yp_pid; |
| 100 | |
| 101 | static void |
| 102 | yp_svc_run(void) |
| 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 fd_setsize = _rpc_dtablesize(); |
| 111 | struct timeval timeout; |
| 112 | |
| 113 | /* Establish the identity of the parent ypserv process. */ |
| 114 | yp_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 | |
| 123 | FD_SET(resfd, &readfds); |
| 124 | |
| 125 | timeout.tv_sec = RESOLVER_TIMEOUT; |
| 126 | timeout.tv_usec = 0; |
| 127 | switch (select(fd_setsize, &readfds, NULL, NULL, |
| 128 | &timeout)) { |
| 129 | case -1: |
| 130 | if (errno == EINTR) { |
| 131 | continue; |
| 132 | } |
| 133 | warn("svc_run: - select failed"); |
| 134 | return; |
| 135 | case 0: |
| 136 | if (getpid() == yp_pid) |
| 137 | yp_prune_dnsq(); |
| 138 | break; |
| 139 | default: |
| 140 | if (getpid() == yp_pid) { |
| 141 | if (FD_ISSET(resfd, &readfds)) { |
| 142 | yp_run_dnsq(); |
| 143 | FD_CLR(resfd, &readfds); |
| 144 | } |
| 145 | svc_getreqset(&readfds); |
| 146 | } |
| 147 | } |
| 148 | if (yp_pid != getpid()) |
| 149 | _exit(0); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | static void |
| 154 | unregister(void) |
| 155 | { |
| 156 | pmap_unset(YPPROG, YPVERS); |
| 157 | pmap_unset(YPPROG, YPOLDVERS); |
| 158 | } |
| 159 | |
| 160 | static void reaper(int sig) |
| 161 | { |
| 162 | int status; |
| 163 | int saved_errno; |
| 164 | |
| 165 | saved_errno = errno; |
| 166 | |
| 167 | if (sig == SIGHUP) { |
| 168 | load_securenets(); |
| 169 | #ifdef DB_CACHE |
| 170 | yp_flush_all(); |
| 171 | #endif |
| 172 | errno = saved_errno; |
| 173 | return; |
| 174 | } |
| 175 | |
| 176 | if (sig == SIGCHLD) { |
| 177 | while (wait3(&status, WNOHANG, NULL) > 0) |
| 178 | children--; |
| 179 | } else { |
| 180 | unregister(); |
| 181 | exit(0); |
| 182 | } |
| 183 | errno = saved_errno; |
| 184 | return; |
| 185 | } |
| 186 | |
| 187 | static void |
| 188 | usage(void) |
| 189 | { |
| 190 | fprintf(stderr, "usage: ypserv [-h] [-d] [-n] [-p path]\n"); |
| 191 | exit(1); |
| 192 | } |
| 193 | |
| 194 | static void |
| 195 | closedown(int sig) |
| 196 | { |
| 197 | if (_rpcsvcstate == _IDLE) { |
| 198 | extern fd_set svc_fdset; |
| 199 | static int size; |
| 200 | int i, openfd; |
| 201 | |
| 202 | if (_rpcfdtype == SOCK_DGRAM) { |
| 203 | unregister(); |
| 204 | exit(0); |
| 205 | } |
| 206 | if (size == 0) { |
| 207 | size = getdtablesize(); |
| 208 | } |
| 209 | for (i = 0, openfd = 0; i < size && openfd < 2; i++) |
| 210 | if (FD_ISSET(i, &svc_fdset)) |
| 211 | openfd++; |
| 212 | if (openfd <= 1) { |
| 213 | unregister(); |
| 214 | exit(0); |
| 215 | } |
| 216 | } |
| 217 | if (_rpcsvcstate == _SERVED) |
| 218 | _rpcsvcstate = _IDLE; |
| 219 | |
| 220 | signal(SIGALRM, (SIG_PF)closedown); |
| 221 | alarm(_RPCSVC_CLOSEDOWN / 2); |
| 222 | } |
| 223 | |
| 224 | int |
| 225 | main(int argc, char **argv) |
| 226 | { |
| 227 | SVCXPRT *transp = NULL; |
| 228 | int sock; |
| 229 | int proto = 0; |
| 230 | struct sockaddr_in saddr; |
| 231 | int asize = sizeof(saddr); |
| 232 | int ch; |
| 233 | |
| 234 | while ((ch = getopt(argc, argv, "hdnp:")) != -1) { |
| 235 | switch (ch) { |
| 236 | case 'd': |
| 237 | debug = ypdb_debug = 1; |
| 238 | break; |
| 239 | case 'n': |
| 240 | do_dns = 1; |
| 241 | break; |
| 242 | case 'p': |
| 243 | yp_dir = optarg; |
| 244 | break; |
| 245 | case 'h': |
| 246 | default: |
| 247 | usage(); |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | load_securenets(); |
| 252 | yp_init_resolver(); |
| 253 | #ifdef DB_CACHE |
| 254 | yp_init_dbs(); |
| 255 | #endif |
| 256 | if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { |
| 257 | int ssize = sizeof (int); |
| 258 | |
| 259 | if (saddr.sin_family != AF_INET) |
| 260 | exit(1); |
| 261 | if (getsockopt(0, SOL_SOCKET, SO_TYPE, |
| 262 | (char *)&_rpcfdtype, &ssize) == -1) |
| 263 | exit(1); |
| 264 | sock = 0; |
| 265 | _rpcpmstart = 1; |
| 266 | proto = 0; |
| 267 | openlog("ypserv", LOG_PID, LOG_DAEMON); |
| 268 | } else { |
| 269 | if (!debug) { |
| 270 | if (daemon(0,0)) { |
| 271 | err(1,"cannot fork"); |
| 272 | } |
| 273 | openlog("ypserv", LOG_PID, LOG_DAEMON); |
| 274 | } |
| 275 | sock = RPC_ANYSOCK; |
| 276 | pmap_unset(YPPROG, YPVERS); |
| 277 | pmap_unset(YPPROG, 1); |
| 278 | } |
| 279 | |
| 280 | if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { |
| 281 | transp = svcudp_create(sock); |
| 282 | if (transp == NULL) { |
| 283 | _msgout("cannot create udp service"); |
| 284 | exit(1); |
| 285 | } |
| 286 | if (!_rpcpmstart) |
| 287 | proto = IPPROTO_UDP; |
| 288 | if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { |
| 289 | _msgout("unable to register (YPPROG, YPOLDVERS, udp)"); |
| 290 | exit(1); |
| 291 | } |
| 292 | if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { |
| 293 | _msgout("unable to register (YPPROG, YPVERS, udp)"); |
| 294 | exit(1); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { |
| 299 | transp = svctcp_create(sock, 0, 0); |
| 300 | if (transp == NULL) { |
| 301 | _msgout("cannot create tcp service"); |
| 302 | exit(1); |
| 303 | } |
| 304 | if (!_rpcpmstart) |
| 305 | proto = IPPROTO_TCP; |
| 306 | if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) { |
| 307 | _msgout("unable to register (YPPROG, YPOLDVERS, tcp)"); |
| 308 | exit(1); |
| 309 | } |
| 310 | if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) { |
| 311 | _msgout("unable to register (YPPROG, YPVERS, tcp)"); |
| 312 | exit(1); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | if (transp == (SVCXPRT *)NULL) { |
| 317 | _msgout("could not create a handle"); |
| 318 | exit(1); |
| 319 | } |
| 320 | if (_rpcpmstart) { |
| 321 | signal(SIGALRM, (SIG_PF)closedown); |
| 322 | alarm(_RPCSVC_CLOSEDOWN / 2); |
| 323 | } |
| 324 | /* |
| 325 | * Make sure SIGPIPE doesn't blow us away while servicing TCP |
| 326 | * connections. |
| 327 | */ |
| 328 | signal(SIGPIPE, SIG_IGN); |
| 329 | signal(SIGCHLD, (SIG_PF) reaper); |
| 330 | signal(SIGTERM, (SIG_PF) reaper); |
| 331 | signal(SIGINT, (SIG_PF) reaper); |
| 332 | signal(SIGHUP, (SIG_PF) reaper); |
| 333 | yp_svc_run(); |
| 334 | _msgout("svc_run returned"); |
| 335 | exit(1); |
| 336 | /* NOTREACHED */ |
| 337 | } |