1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995, 1996 5 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Bill Paul. 18 * 4. Neither the name of the author nor the names of any co-contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include "ypxfrd.h" 39 #include <err.h> 40 #include <fcntl.h> 41 #include <paths.h> 42 #include <stdio.h> 43 #include <stdlib.h> /* getenv, exit */ 44 #include <unistd.h> 45 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 46 #include <rpc/rpc_com.h> 47 #include <string.h> /* strcmp */ 48 #include <signal.h> 49 #include <sys/ttycom.h> /* TIOCNOTTY */ 50 #ifdef __cplusplus 51 #include <sysent.h> /* getdtablesize, open */ 52 #endif /* __cplusplus */ 53 #include <memory.h> 54 #include <sys/socket.h> 55 #include <netinet/in.h> 56 #include <syslog.h> 57 #include "ypxfrd_extern.h" 58 #include <sys/wait.h> 59 #include <errno.h> 60 61 #ifndef SIG_PF 62 #define SIG_PF void(*)(int) 63 #endif 64 65 #ifdef DEBUG 66 #define RPC_SVC_FG 67 #endif 68 69 #define _RPCSVC_CLOSEDOWN 120 70 int _rpcpmstart; /* Started by a port monitor ? */ 71 static int _rpcfdtype; 72 /* Whether Stream or Datagram ? */ 73 /* States a server can be in wrt request */ 74 75 #define _IDLE 0 76 #define _SERVED 1 77 #define _SERVING 2 78 79 extern int _rpcsvcstate; /* Set when a request is serviced */ 80 81 int debug; 82 83 char *progname = "rpc.ypxfrd"; 84 char *yp_dir = "/var/yp/"; 85 86 static void 87 _msgout(char *msg) 88 { 89 #ifdef RPC_SVC_FG 90 if (_rpcpmstart) 91 syslog(LOG_ERR, "%s", msg); 92 else 93 warnx("%s", msg); 94 #else 95 syslog(LOG_ERR, "%s", msg); 96 #endif 97 } 98 99 static void 100 closedown(int sig) 101 { 102 if (_rpcsvcstate == _IDLE) { 103 extern fd_set svc_fdset; 104 static int size; 105 int i, openfd; 106 107 if (_rpcfdtype == SOCK_DGRAM) 108 exit(0); 109 if (size == 0) { 110 size = getdtablesize(); 111 } 112 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 113 if (FD_ISSET(i, &svc_fdset)) 114 openfd++; 115 if (openfd <= 1) 116 exit(0); 117 } 118 if (_rpcsvcstate == _SERVED) 119 _rpcsvcstate = _IDLE; 120 121 (void) signal(SIGALRM, (SIG_PF) closedown); 122 (void) alarm(_RPCSVC_CLOSEDOWN/2); 123 } 124 125 126 static void 127 ypxfrd_svc_run(void) 128 { 129 #ifdef FD_SETSIZE 130 fd_set readfds; 131 #else 132 int readfds; 133 #endif /* def FD_SETSIZE */ 134 extern int forked; 135 int pid; 136 int fd_setsize = _rpc_dtablesize(); 137 138 /* Establish the identity of the parent ypserv process. */ 139 pid = getpid(); 140 141 for (;;) { 142 #ifdef FD_SETSIZE 143 readfds = svc_fdset; 144 #else 145 readfds = svc_fds; 146 #endif /* def FD_SETSIZE */ 147 switch (select(fd_setsize, &readfds, NULL, NULL, 148 (struct timeval *)0)) { 149 case -1: 150 if (errno == EINTR) { 151 continue; 152 } 153 warn("svc_run: - select failed"); 154 return; 155 case 0: 156 continue; 157 default: 158 svc_getreqset(&readfds); 159 if (forked && pid != getpid()) 160 exit(0); 161 } 162 } 163 } 164 165 static void reaper(int sig) 166 { 167 int status; 168 int saved_errno; 169 170 saved_errno = errno; 171 172 if (sig == SIGHUP) { 173 load_securenets(); 174 errno = saved_errno; 175 return; 176 } 177 178 if (sig == SIGCHLD) { 179 while (wait3(&status, WNOHANG, NULL) > 0) 180 children--; 181 } else { 182 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS); 183 exit(0); 184 } 185 186 errno = saved_errno; 187 return; 188 } 189 190 void 191 usage(void) 192 { 193 fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n"); 194 exit(0); 195 } 196 197 int 198 main(int argc, char *argv[]) 199 { 200 register SVCXPRT *transp = NULL; 201 int sock; 202 int proto = 0; 203 struct sockaddr_in saddr; 204 int asize = sizeof (saddr); 205 int ch; 206 207 while ((ch = getopt(argc, argv, "p:h")) != -1) { 208 switch (ch) { 209 case 'p': 210 yp_dir = optarg; 211 break; 212 default: 213 usage(); 214 break; 215 } 216 } 217 218 load_securenets(); 219 220 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 221 int ssize = sizeof (int); 222 223 if (saddr.sin_family != AF_INET) 224 exit(1); 225 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 226 (char *)&_rpcfdtype, &ssize) == -1) 227 exit(1); 228 sock = 0; 229 _rpcpmstart = 1; 230 proto = 0; 231 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON); 232 } else { 233 #ifndef RPC_SVC_FG 234 int size; 235 int pid, i; 236 237 pid = fork(); 238 if (pid < 0) 239 err(1, "fork"); 240 if (pid) 241 exit(0); 242 size = getdtablesize(); 243 for (i = 0; i < size; i++) 244 (void) close(i); 245 i = open(_PATH_CONSOLE, 2); 246 (void) dup2(i, 1); 247 (void) dup2(i, 2); 248 i = open(_PATH_TTY, 2); 249 if (i >= 0) { 250 (void) ioctl(i, TIOCNOTTY, (char *)NULL); 251 (void) close(i); 252 } 253 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON); 254 #endif 255 sock = RPC_ANYSOCK; 256 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS); 257 } 258 259 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 260 transp = svcudp_create(sock); 261 if (transp == NULL) { 262 _msgout("cannot create udp service."); 263 exit(1); 264 } 265 if (!_rpcpmstart) 266 proto = IPPROTO_UDP; 267 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) { 268 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp)."); 269 exit(1); 270 } 271 } 272 273 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 274 transp = svctcp_create(sock, 0, 0); 275 if (transp == NULL) { 276 _msgout("cannot create tcp service."); 277 exit(1); 278 } 279 if (!_rpcpmstart) 280 proto = IPPROTO_TCP; 281 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) { 282 _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp)."); 283 exit(1); 284 } 285 } 286 287 if (transp == (SVCXPRT *)NULL) { 288 _msgout("could not create a handle"); 289 exit(1); 290 } 291 if (_rpcpmstart) { 292 (void) signal(SIGALRM, (SIG_PF) closedown); 293 (void) alarm(_RPCSVC_CLOSEDOWN/2); 294 } 295 296 (void) signal(SIGPIPE, SIG_IGN); 297 (void) signal(SIGCHLD, (SIG_PF) reaper); 298 (void) signal(SIGTERM, (SIG_PF) reaper); 299 (void) signal(SIGINT, (SIG_PF) reaper); 300 (void) signal(SIGHUP, (SIG_PF) reaper); 301 302 ypxfrd_svc_run(); 303 _msgout("svc_run returned"); 304 exit(1); 305 /* NOTREACHED */ 306 } 307