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 #ifndef lint 34 static const char rcsid[] = 35 "$FreeBSD$"; 36 #endif /* not lint */ 37 38 #include "ypupdate_prot.h" 39 #include <stdio.h> 40 #include <stdlib.h> /* getenv, exit */ 41 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 42 #include <string.h> /* strcmp */ 43 #include <signal.h> 44 #include <sys/ttycom.h> /* TIOCNOTTY */ 45 #ifdef __cplusplus 46 #include <sysent.h> /* getdtablesize, open */ 47 #endif /* __cplusplus */ 48 #include <memory.h> 49 #include <sys/socket.h> 50 #include <netinet/in.h> 51 #include <syslog.h> 52 #include <sys/wait.h> 53 #include <errno.h> 54 #include <err.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 #include "ypupdated_extern.h" 58 #include "yp_extern.h" 59 60 #ifndef SIG_PF 61 #define SIG_PF void(*)(int) 62 #endif 63 64 #ifdef DEBUG 65 #define RPC_SVC_FG 66 #endif 67 68 #define _RPCSVC_CLOSEDOWN 120 69 int _rpcpmstart; /* Started by a port monitor ? */ 70 static int _rpcfdtype; 71 /* Whether Stream or Datagram ? */ 72 /* States a server can be in wrt request */ 73 74 #define _IDLE 0 75 #define _SERVED 1 76 #define _SERVING 2 77 78 extern int _rpcsvcstate; /* Set when a request is serviced */ 79 80 char *progname = "rpc.ypupdated"; 81 char *yp_dir = "/var/yp/"; 82 83 static 84 void _msgout(char* msg) 85 { 86 #ifdef RPC_SVC_FG 87 if (_rpcpmstart) 88 syslog(LOG_ERR, msg); 89 else 90 warnx("%s", msg); 91 #else 92 syslog(LOG_ERR, msg); 93 #endif 94 } 95 96 static void 97 closedown(int sig) 98 { 99 if (_rpcsvcstate == _IDLE) { 100 extern fd_set svc_fdset; 101 static int size; 102 int i, openfd; 103 104 if (_rpcfdtype == SOCK_DGRAM) 105 exit(0); 106 if (size == 0) { 107 size = getdtablesize(); 108 } 109 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 110 if (FD_ISSET(i, &svc_fdset)) 111 openfd++; 112 if (openfd <= 1) 113 exit(0); 114 } 115 if (_rpcsvcstate == _SERVED) 116 _rpcsvcstate = _IDLE; 117 118 (void) signal(SIGALRM, (SIG_PF) closedown); 119 (void) alarm(_RPCSVC_CLOSEDOWN/2); 120 } 121 122 static void 123 ypupdated_svc_run() 124 { 125 #ifdef FD_SETSIZE 126 fd_set readfds; 127 #else 128 int readfds; 129 #endif /* def FD_SETSIZE */ 130 extern int forked; 131 int pid; 132 int fd_setsize = _rpc_dtablesize(); 133 134 /* Establish the identity of the parent ypupdated process. */ 135 pid = getpid(); 136 137 for (;;) { 138 #ifdef FD_SETSIZE 139 readfds = svc_fdset; 140 #else 141 readfds = svc_fds; 142 #endif /* def FD_SETSIZE */ 143 switch (select(fd_setsize, &readfds, NULL, NULL, 144 (struct timeval *)0)) { 145 case -1: 146 if (errno == EINTR) { 147 continue; 148 } 149 warn("svc_run: - select failed"); 150 return; 151 case 0: 152 continue; 153 default: 154 svc_getreqset(&readfds); 155 if (forked && pid != getpid()) 156 exit(0); 157 } 158 } 159 } 160 161 static void reaper(sig) 162 int sig; 163 { 164 int status; 165 166 if (sig == SIGHUP) { 167 #ifdef foo 168 load_securenets(); 169 #endif 170 return; 171 } 172 173 if (sig == SIGCHLD) { 174 while (wait3(&status, WNOHANG, NULL) > 0) 175 children--; 176 } else { 177 (void) pmap_unset(YPU_PROG, YPU_VERS); 178 exit(0); 179 } 180 } 181 182 void usage() 183 { 184 fprintf(stderr, "rpc.ypupdatedd [-p path]\n"); 185 exit(0); 186 } 187 188 int 189 main(argc, argv) 190 int argc; 191 char *argv[]; 192 { 193 register SVCXPRT *transp = NULL; 194 int sock; 195 int proto = 0; 196 struct sockaddr_in saddr; 197 int asize = sizeof (saddr); 198 int ch; 199 200 while ((ch = getopt(argc, argv, "p:h")) != -1) { 201 switch(ch) { 202 case 'p': 203 yp_dir = optarg; 204 break; 205 default: 206 usage(); 207 break; 208 } 209 } 210 #ifdef foo 211 load_securenets(); 212 #endif 213 214 if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) { 215 yp_error("failed to register AUTH_DES flavor"); 216 exit(1); 217 } 218 219 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 220 int ssize = sizeof (int); 221 222 if (saddr.sin_family != AF_INET) 223 exit(1); 224 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 225 (char *)&_rpcfdtype, &ssize) == -1) 226 exit(1); 227 sock = 0; 228 _rpcpmstart = 1; 229 proto = 0; 230 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON); 231 } else { 232 #ifndef RPC_SVC_FG 233 if (daemon(0,0)) { 234 err(1, "cannot fork"); 235 } 236 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON); 237 #endif 238 sock = RPC_ANYSOCK; 239 (void) pmap_unset(YPU_PROG, YPU_VERS); 240 } 241 242 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 243 transp = svcudp_create(sock); 244 if (transp == NULL) { 245 _msgout("cannot create udp service."); 246 exit(1); 247 } 248 if (!_rpcpmstart) 249 proto = IPPROTO_UDP; 250 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 251 _msgout("unable to register (YPU_PROG, YPU_VERS, udp)."); 252 exit(1); 253 } 254 } 255 256 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 257 transp = svctcp_create(sock, 0, 0); 258 if (transp == NULL) { 259 _msgout("cannot create tcp service."); 260 exit(1); 261 } 262 if (!_rpcpmstart) 263 proto = IPPROTO_TCP; 264 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) { 265 _msgout("unable to register (YPU_PROG, YPU_VERS, tcp)."); 266 exit(1); 267 } 268 } 269 270 if (transp == (SVCXPRT *)NULL) { 271 _msgout("could not create a handle"); 272 exit(1); 273 } 274 if (_rpcpmstart) { 275 (void) signal(SIGALRM, (SIG_PF) closedown); 276 (void) alarm(_RPCSVC_CLOSEDOWN/2); 277 } 278 279 (void) signal(SIGPIPE, SIG_IGN); 280 (void) signal(SIGCHLD, (SIG_PF) reaper); 281 (void) signal(SIGTERM, (SIG_PF) reaper); 282 (void) signal(SIGINT, (SIG_PF) reaper); 283 (void) signal(SIGHUP, (SIG_PF) reaper); 284 285 ypupdated_svc_run(); 286 _msgout("svc_run returned"); 287 exit(1); 288 /* NOTREACHED */ 289 } 290