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 * $FreeBSD: src/usr.sbin/rpc.ypupdated/ypupdated_main.c,v 1.4.2.3 2002/02/15 00:46:58 des Exp $ 33 * $DragonFly: src/usr.sbin/rpc.ypupdated/ypupdated_main.c,v 1.2 2003/06/17 04:30:02 dillon Exp $ 34 */ 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 <string.h> /* strcmp */ 41 #include <signal.h> 42 #ifdef __cplusplus 43 #include <sysent.h> /* getdtablesize, open */ 44 #endif /* __cplusplus */ 45 #include <memory.h> 46 #include <sys/socket.h> 47 #include <netinet/in.h> 48 #include <syslog.h> 49 #include <sys/wait.h> 50 #include <errno.h> 51 #include <err.h> 52 #include <stdlib.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 81 void _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() 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 reaper(sig) 159 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 usage() 180 { 181 fprintf(stderr, "rpc.ypupdatedd [-p path]\n"); 182 exit(0); 183 } 184 185 int 186 main(argc, argv) 187 int argc; 188 char *argv[]; 189 { 190 register SVCXPRT *transp = NULL; 191 int sock; 192 int proto = 0; 193 struct sockaddr_in saddr; 194 int asize = sizeof (saddr); 195 int ch; 196 197 while ((ch = getopt(argc, argv, "p:h")) != -1) { 198 switch (ch) { 199 case 'p': 200 yp_dir = optarg; 201 break; 202 default: 203 usage(); 204 break; 205 } 206 } 207 #ifdef foo 208 load_securenets(); 209 #endif 210 211 if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) { 212 yp_error("failed to register AUTH_DES flavor"); 213 exit(1); 214 } 215 216 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 217 int ssize = sizeof (int); 218 219 if (saddr.sin_family != AF_INET) 220 exit(1); 221 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 222 (char *)&_rpcfdtype, &ssize) == -1) 223 exit(1); 224 sock = 0; 225 _rpcpmstart = 1; 226 proto = 0; 227 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON); 228 } else { 229 #ifndef RPC_SVC_FG 230 if (daemon(0,0)) { 231 err(1, "cannot fork"); 232 } 233 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON); 234 #endif 235 sock = RPC_ANYSOCK; 236 (void) pmap_unset(YPU_PROG, YPU_VERS); 237 } 238 239 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 240 transp = svcudp_create(sock); 241 if (transp == NULL) { 242 _msgout("cannot create udp service."); 243 exit(1); 244 } 245 if (!_rpcpmstart) 246 proto = IPPROTO_UDP; 247 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 248 _msgout("unable to register (YPU_PROG, YPU_VERS, udp)."); 249 exit(1); 250 } 251 } 252 253 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 254 transp = svctcp_create(sock, 0, 0); 255 if (transp == NULL) { 256 _msgout("cannot create tcp service."); 257 exit(1); 258 } 259 if (!_rpcpmstart) 260 proto = IPPROTO_TCP; 261 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 262 _msgout("unable to register (YPU_PROG, YPU_VERS, tcp)."); 263 exit(1); 264 } 265 } 266 267 if (transp == (SVCXPRT *)NULL) { 268 _msgout("could not create a handle"); 269 exit(1); 270 } 271 if (_rpcpmstart) { 272 (void) signal(SIGALRM, (SIG_PF) closedown); 273 (void) alarm(_RPCSVC_CLOSEDOWN/2); 274 } 275 276 (void) signal(SIGPIPE, SIG_IGN); 277 (void) signal(SIGCHLD, (SIG_PF) reaper); 278 (void) signal(SIGTERM, (SIG_PF) reaper); 279 (void) signal(SIGINT, (SIG_PF) reaper); 280 (void) signal(SIGHUP, (SIG_PF) reaper); 281 282 ypupdated_svc_run(); 283 _msgout("svc_run returned"); 284 exit(1); 285 /* NOTREACHED */ 286 } 287