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