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 <sys/param.h> 37 #include <sys/ioctl.h> 38 #include <sys/stat.h> 39 #include <sys/socket.h> 40 #include <sys/time.h> 41 #include <sys/resource.h> 42 #include <netinet/in.h> 43 44 #include <err.h> 45 #include <errno.h> 46 #include <fcntl.h> 47 #include <memory.h> 48 #include <signal.h> 49 #include <stdio.h> 50 #include <stdlib.h> /* getenv, exit */ 51 #include <string.h> /* strcmp */ 52 #include <syslog.h> 53 #include <unistd.h> 54 55 #include <rpc/rpc.h> 56 #include <rpc/rpc_com.h> 57 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 58 #include <rpcsvc/yp.h> 59 #include <rpcsvc/ypclnt.h> 60 61 #include "yppasswd.h" 62 #include "yppasswdd_extern.h" 63 #include "yppasswd_private.h" 64 #include "ypxfr_extern.h" 65 #include "yp_extern.h" 66 67 #ifndef SIG_PF 68 #define SIG_PF void(*)(int) 69 #endif 70 71 #ifdef DEBUG 72 #define RPC_SVC_FG 73 #endif 74 75 #define _RPCSVC_CLOSEDOWN 120 76 int _rpcpmstart = 0; /* Started by a port monitor ? */ 77 static int _rpcfdtype; 78 /* Whether Stream or Datagram ? */ 79 /* States a server can be in wrt request */ 80 81 #define _IDLE 0 82 #define _SERVED 1 83 #define _SERVING 2 84 85 static char _localhost[] = "localhost"; 86 static char _passwd_byname[] = "passwd.byname"; 87 extern int _rpcsvcstate; /* Set when a request is serviced */ 88 static char _progname[] = "rpc.yppasswdd"; 89 char *progname = _progname; 90 static char _yp_dir[] = _PATH_YP; 91 char *yp_dir = _yp_dir; 92 static char _passfile_default[] = _PATH_YP "master.passwd"; 93 char *passfile_default = _passfile_default; 94 char *passfile; 95 char *yppasswd_domain = NULL; 96 int no_chsh = 0; 97 int no_chfn = 0; 98 int allow_additions = 0; 99 int multidomain = 0; 100 int verbose = 0; 101 int resvport = 1; 102 int inplace = 0; 103 char sockname[] = YP_SOCKNAME; 104 105 static void 106 terminate(int sig __unused) 107 { 108 rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL); 109 rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL); 110 unlink(sockname); 111 exit(0); 112 } 113 114 static void 115 reload(int sig __unused) 116 { 117 load_securenets(); 118 } 119 120 static void 121 closedown(int sig __unused) 122 { 123 if (_rpcsvcstate == _IDLE) { 124 extern fd_set svc_fdset; 125 static int size; 126 int i, openfd; 127 128 if (_rpcfdtype == SOCK_DGRAM) { 129 unlink(sockname); 130 exit(0); 131 } 132 if (size == 0) { 133 size = getdtablesize(); 134 } 135 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 136 if (FD_ISSET(i, &svc_fdset)) 137 openfd++; 138 if (openfd <= 1) { 139 unlink(sockname); 140 exit(0); 141 } 142 } 143 if (_rpcsvcstate == _SERVED) 144 _rpcsvcstate = _IDLE; 145 146 (void) signal(SIGALRM, (SIG_PF) closedown); 147 (void) alarm(_RPCSVC_CLOSEDOWN/2); 148 } 149 150 static void 151 usage(void) 152 { 153 fprintf(stderr, "%s\n%s\n", 154 "usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]", 155 " [-f] [-m] [-i] [-a] [-v] [-u] [-h]"); 156 exit(1); 157 } 158 159 int 160 main(int argc, char *argv[]) 161 { 162 struct rlimit rlim; 163 SVCXPRT *transp = NULL; 164 struct sockaddr_in saddr; 165 socklen_t asize = sizeof (saddr); 166 struct netconfig *nconf; 167 struct sigaction sa; 168 void *localhandle; 169 int ch; 170 char *mastername; 171 char myname[MAXHOSTNAMELEN + 2]; 172 int maxrec = RPC_MAXDATASIZE; 173 174 extern int debug; 175 176 debug = 1; 177 178 while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) { 179 switch (ch) { 180 case 't': 181 passfile_default = optarg; 182 break; 183 case 'd': 184 yppasswd_domain = optarg; 185 break; 186 case 's': 187 no_chsh++; 188 break; 189 case 'f': 190 no_chfn++; 191 break; 192 case 'p': 193 yp_dir = optarg; 194 break; 195 case 'a': 196 allow_additions++; 197 break; 198 case 'm': 199 multidomain++; 200 break; 201 case 'i': 202 inplace++; 203 break; 204 case 'v': 205 verbose++; 206 break; 207 case 'u': 208 resvport = 0; 209 break; 210 default: 211 case 'h': 212 usage(); 213 break; 214 } 215 } 216 217 if (yppasswd_domain == NULL) { 218 if (yp_get_default_domain(&yppasswd_domain)) { 219 yp_error("no domain specified and system domain \ 220 name isn't set -- aborting"); 221 usage(); 222 } 223 } 224 225 load_securenets(); 226 227 if (getrpcport(_localhost, YPPROG, YPVERS, IPPROTO_UDP) <= 0) { 228 yp_error("no ypserv processes registered with local portmap"); 229 yp_error("this host is not an NIS server -- aborting"); 230 exit(1); 231 } 232 233 if ((mastername = ypxfr_get_master(yppasswd_domain, 234 _passwd_byname, _localhost, 0)) == NULL) { 235 yp_error("can't get name of NIS master server for domain %s", 236 yppasswd_domain); 237 exit(1); 238 } 239 240 if (gethostname((char *)&myname, sizeof(myname)) == -1) { 241 yp_error("can't get local hostname: %s", strerror(errno)); 242 exit(1); 243 } 244 245 if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) { 246 yp_error("master of %s is %s, but we are %s", 247 "passwd.byname", mastername, myname); 248 yp_error("this host is not the NIS master server for \ 249 the %s domain -- aborting", yppasswd_domain); 250 exit(1); 251 } 252 253 debug = 0; 254 255 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 256 socklen_t ssize = sizeof (int); 257 if (saddr.sin_family != AF_INET) 258 exit(1); 259 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 260 (char *)&_rpcfdtype, &ssize) == -1) 261 exit(1); 262 _rpcpmstart = 1; 263 } 264 265 if (!debug && _rpcpmstart == 0) { 266 if (daemon(0,0)) { 267 err(1,"cannot fork"); 268 } 269 } 270 openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON); 271 memset(&sa, 0, sizeof(sa)); 272 sa.sa_flags = SA_NOCLDWAIT; 273 sigaction(SIGCHLD, &sa, NULL); 274 275 rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL); 276 rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL); 277 278 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 279 280 if (svc_create(yppasswdprog_1, YPPASSWDPROG, YPPASSWDVERS, "netpath") == 0) { 281 yp_error("cannot create yppasswd service."); 282 exit(1); 283 } 284 if (svc_create(master_yppasswdprog_1, MASTER_YPPASSWDPROG, 285 MASTER_YPPASSWDVERS, "netpath") == 0) { 286 yp_error("cannot create master_yppasswd service."); 287 exit(1); 288 } 289 290 nconf = NULL; 291 localhandle = setnetconfig(); 292 while ((nconf = getnetconfig(localhandle)) != NULL) { 293 if (nconf->nc_protofmly != NULL && 294 strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) 295 break; 296 } 297 if (nconf == NULL) { 298 yp_error("getnetconfigent unix: %s", nc_sperror()); 299 exit(1); 300 } 301 unlink(sockname); 302 transp = svcunix_create(RPC_ANYSOCK, 0, 0, sockname); 303 if (transp == NULL) { 304 yp_error("cannot create AF_LOCAL service."); 305 exit(1); 306 } 307 if (!svc_reg(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, 308 master_yppasswdprog_1, nconf)) { 309 yp_error("unable to register (MASTER_YPPASSWDPROG, \ 310 MASTER_YPPASSWDVERS, unix)."); 311 exit(1); 312 } 313 endnetconfig(localhandle); 314 315 /* Only root may connect() to the AF_UNIX link. */ 316 if (chmod(sockname, 0)) 317 err(1, "chmod of %s failed", sockname); 318 319 if (transp == (SVCXPRT *)NULL) { 320 yp_error("could not create a handle"); 321 exit(1); 322 } 323 if (_rpcpmstart) { 324 (void) signal(SIGALRM, (SIG_PF) closedown); 325 (void) alarm(_RPCSVC_CLOSEDOWN/2); 326 } 327 328 /* Unlimited resource limits. */ 329 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 330 (void)setrlimit(RLIMIT_CPU, &rlim); 331 (void)setrlimit(RLIMIT_FSIZE, &rlim); 332 (void)setrlimit(RLIMIT_STACK, &rlim); 333 (void)setrlimit(RLIMIT_DATA, &rlim); 334 (void)setrlimit(RLIMIT_RSS, &rlim); 335 336 /* Don't drop core (not really necessary, but GP's). */ 337 rlim.rlim_cur = rlim.rlim_max = 0; 338 (void)setrlimit(RLIMIT_CORE, &rlim); 339 340 /* Turn off signals. */ 341 (void)signal(SIGALRM, SIG_IGN); 342 (void)signal(SIGHUP, (SIG_PF) reload); 343 (void)signal(SIGINT, SIG_IGN); 344 (void)signal(SIGPIPE, SIG_IGN); 345 (void)signal(SIGQUIT, SIG_IGN); 346 (void)signal(SIGTERM, (SIG_PF) terminate); 347 348 svc_run(); 349 yp_error("svc_run returned"); 350 exit(1); 351 /* NOTREACHED */ 352 } 353