1 /* 2 * Copyright (c) 1995, 1996 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 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "ypupdate_prot.h" 37 #include <stdio.h> 38 #include <stdlib.h> /* getenv, exit */ 39 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 40 #include <rpc/rpc_com.h> 41 #include <string.h> /* strcmp */ 42 #include <signal.h> 43 #ifdef __cplusplus 44 #include <sysent.h> /* getdtablesize, open */ 45 #endif /* __cplusplus */ 46 #include <memory.h> 47 #include <sys/socket.h> 48 #include <netinet/in.h> 49 #include <syslog.h> 50 #include <sys/wait.h> 51 #include <errno.h> 52 #include <err.h> 53 #include <unistd.h> 54 #include "ypupdated_extern.h" 55 #include "yp_extern.h" 56 57 #ifndef SIG_PF 58 #define SIG_PF void(*)(int) 59 #endif 60 61 #ifdef DEBUG 62 #define RPC_SVC_FG 63 #endif 64 65 #define _RPCSVC_CLOSEDOWN 120 66 int _rpcpmstart; /* Started by a port monitor ? */ 67 static int _rpcfdtype; 68 /* Whether Stream or Datagram ? */ 69 /* States a server can be in wrt request */ 70 71 #define _IDLE 0 72 #define _SERVED 1 73 #define _SERVING 2 74 75 extern int _rpcsvcstate; /* Set when a request is serviced */ 76 77 char *progname = "rpc.ypupdated"; 78 char *yp_dir = "/var/yp/"; 79 80 static void 81 _msgout(char* msg) 82 { 83 #ifdef RPC_SVC_FG 84 if (_rpcpmstart) 85 syslog(LOG_ERR, "%s", msg); 86 else 87 warnx("%s", msg); 88 #else 89 syslog(LOG_ERR, "%s", msg); 90 #endif 91 } 92 93 static void 94 closedown(int sig) 95 { 96 if (_rpcsvcstate == _IDLE) { 97 extern fd_set svc_fdset; 98 static int size; 99 int i, openfd; 100 101 if (_rpcfdtype == SOCK_DGRAM) 102 exit(0); 103 if (size == 0) { 104 size = getdtablesize(); 105 } 106 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 107 if (FD_ISSET(i, &svc_fdset)) 108 openfd++; 109 if (openfd <= 1) 110 exit(0); 111 } 112 if (_rpcsvcstate == _SERVED) 113 _rpcsvcstate = _IDLE; 114 115 (void) signal(SIGALRM, (SIG_PF) closedown); 116 (void) alarm(_RPCSVC_CLOSEDOWN/2); 117 } 118 119 static void 120 ypupdated_svc_run(void) 121 { 122 #ifdef FD_SETSIZE 123 fd_set readfds; 124 #else 125 int readfds; 126 #endif /* def FD_SETSIZE */ 127 extern int forked; 128 int pid; 129 int fd_setsize = _rpc_dtablesize(); 130 131 /* Establish the identity of the parent ypupdated process. */ 132 pid = getpid(); 133 134 for (;;) { 135 #ifdef FD_SETSIZE 136 readfds = svc_fdset; 137 #else 138 readfds = svc_fds; 139 #endif /* def FD_SETSIZE */ 140 switch (select(fd_setsize, &readfds, NULL, NULL, 141 (struct timeval *)0)) { 142 case -1: 143 if (errno == EINTR) { 144 continue; 145 } 146 warn("svc_run: - select failed"); 147 return; 148 case 0: 149 continue; 150 default: 151 svc_getreqset(&readfds); 152 if (forked && pid != getpid()) 153 exit(0); 154 } 155 } 156 } 157 158 static void 159 reaper(int sig) 160 { 161 int status; 162 163 if (sig == SIGHUP) { 164 #ifdef foo 165 load_securenets(); 166 #endif 167 return; 168 } 169 170 if (sig == SIGCHLD) { 171 while (wait3(&status, WNOHANG, NULL) > 0) 172 children--; 173 } else { 174 (void) pmap_unset(YPU_PROG, YPU_VERS); 175 exit(0); 176 } 177 } 178 179 void 180 usage(void) 181 { 182 fprintf(stderr, "rpc.ypupdatedd [-p path]\n"); 183 exit(0); 184 } 185 186 int 187 main(int argc, char *argv[]) 188 { 189 register SVCXPRT *transp = NULL; 190 int sock; 191 int proto = 0; 192 struct sockaddr_in saddr; 193 int asize = sizeof (saddr); 194 int ch; 195 196 while ((ch = getopt(argc, argv, "p:h")) != -1) { 197 switch (ch) { 198 case 'p': 199 yp_dir = optarg; 200 break; 201 default: 202 usage(); 203 break; 204 } 205 } 206 #ifdef foo 207 load_securenets(); 208 #endif 209 210 if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) { 211 yp_error("failed to register AUTH_DES flavor"); 212 exit(1); 213 } 214 215 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 216 int ssize = sizeof (int); 217 218 if (saddr.sin_family != AF_INET) 219 exit(1); 220 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 221 (char *)&_rpcfdtype, &ssize) == -1) 222 exit(1); 223 sock = 0; 224 _rpcpmstart = 1; 225 proto = 0; 226 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON); 227 } else { 228 #ifndef RPC_SVC_FG 229 if (daemon(0,0)) { 230 err(1, "cannot fork"); 231 } 232 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON); 233 #endif 234 sock = RPC_ANYSOCK; 235 (void) pmap_unset(YPU_PROG, YPU_VERS); 236 } 237 238 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 239 transp = svcudp_create(sock); 240 if (transp == NULL) { 241 _msgout("cannot create udp service."); 242 exit(1); 243 } 244 if (!_rpcpmstart) 245 proto = IPPROTO_UDP; 246 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 247 _msgout("unable to register (YPU_PROG, YPU_VERS, udp)."); 248 exit(1); 249 } 250 } 251 252 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 253 transp = svctcp_create(sock, 0, 0); 254 if (transp == NULL) { 255 _msgout("cannot create tcp service."); 256 exit(1); 257 } 258 if (!_rpcpmstart) 259 proto = IPPROTO_TCP; 260 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 261 _msgout("unable to register (YPU_PROG, YPU_VERS, tcp)."); 262 exit(1); 263 } 264 } 265 266 if (transp == (SVCXPRT *)NULL) { 267 _msgout("could not create a handle"); 268 exit(1); 269 } 270 if (_rpcpmstart) { 271 (void) signal(SIGALRM, (SIG_PF) closedown); 272 (void) alarm(_RPCSVC_CLOSEDOWN/2); 273 } 274 275 (void) signal(SIGPIPE, SIG_IGN); 276 (void) signal(SIGCHLD, (SIG_PF) reaper); 277 (void) signal(SIGTERM, (SIG_PF) reaper); 278 (void) signal(SIGINT, (SIG_PF) reaper); 279 (void) signal(SIGHUP, (SIG_PF) reaper); 280 281 ypupdated_svc_run(); 282 _msgout("svc_run returned"); 283 exit(1); 284 /* NOTREACHED */ 285 } 286