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 <stdlib.h> 54 #include <unistd.h> 55 #include "ypupdated_extern.h" 56 #include "yp_extern.h" 57 58 #ifndef SIG_PF 59 #define SIG_PF void(*)(int) 60 #endif 61 62 #ifdef DEBUG 63 #define RPC_SVC_FG 64 #endif 65 66 #define _RPCSVC_CLOSEDOWN 120 67 int _rpcpmstart; /* Started by a port monitor ? */ 68 static int _rpcfdtype; 69 /* Whether Stream or Datagram ? */ 70 /* States a server can be in wrt request */ 71 72 #define _IDLE 0 73 #define _SERVED 1 74 #define _SERVING 2 75 76 extern int _rpcsvcstate; /* Set when a request is serviced */ 77 78 char *progname = "rpc.ypupdated"; 79 char *yp_dir = "/var/yp/"; 80 81 static void 82 _msgout(char* msg) 83 { 84 #ifdef RPC_SVC_FG 85 if (_rpcpmstart) 86 syslog(LOG_ERR, "%s", msg); 87 else 88 warnx("%s", msg); 89 #else 90 syslog(LOG_ERR, "%s", msg); 91 #endif 92 } 93 94 static void 95 closedown(int sig) 96 { 97 if (_rpcsvcstate == _IDLE) { 98 extern fd_set svc_fdset; 99 static int size; 100 int i, openfd; 101 102 if (_rpcfdtype == SOCK_DGRAM) 103 exit(0); 104 if (size == 0) { 105 size = getdtablesize(); 106 } 107 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 108 if (FD_ISSET(i, &svc_fdset)) 109 openfd++; 110 if (openfd <= 1) 111 exit(0); 112 } 113 if (_rpcsvcstate == _SERVED) 114 _rpcsvcstate = _IDLE; 115 116 (void) signal(SIGALRM, (SIG_PF) closedown); 117 (void) alarm(_RPCSVC_CLOSEDOWN/2); 118 } 119 120 static void 121 ypupdated_svc_run(void) 122 { 123 #ifdef FD_SETSIZE 124 fd_set readfds; 125 #else 126 int readfds; 127 #endif /* def FD_SETSIZE */ 128 extern int forked; 129 int pid; 130 int fd_setsize = _rpc_dtablesize(); 131 132 /* Establish the identity of the parent ypupdated process. */ 133 pid = getpid(); 134 135 for (;;) { 136 #ifdef FD_SETSIZE 137 readfds = svc_fdset; 138 #else 139 readfds = svc_fds; 140 #endif /* def FD_SETSIZE */ 141 switch (select(fd_setsize, &readfds, NULL, NULL, 142 (struct timeval *)0)) { 143 case -1: 144 if (errno == EINTR) { 145 continue; 146 } 147 warn("svc_run: - select failed"); 148 return; 149 case 0: 150 continue; 151 default: 152 svc_getreqset(&readfds); 153 if (forked && pid != getpid()) 154 exit(0); 155 } 156 } 157 } 158 159 static void 160 reaper(int sig) 161 { 162 int status; 163 164 if (sig == SIGHUP) { 165 #ifdef foo 166 load_securenets(); 167 #endif 168 return; 169 } 170 171 if (sig == SIGCHLD) { 172 while (wait3(&status, WNOHANG, NULL) > 0) 173 children--; 174 } else { 175 (void) pmap_unset(YPU_PROG, YPU_VERS); 176 exit(0); 177 } 178 } 179 180 void 181 usage(void) 182 { 183 fprintf(stderr, "rpc.ypupdatedd [-p path]\n"); 184 exit(0); 185 } 186 187 int 188 main(int argc, 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