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 "$Id: yppasswdd_main.c,v 1.12 1997/10/13 11:18:50 charnier Exp $"; 36 #endif /* not lint */ 37 38 #include "yppasswd.h" 39 #include <stdio.h> 40 #include <sys/types.h> 41 #include <stdlib.h> /* getenv, exit */ 42 #include <unistd.h> 43 #include <string.h> 44 #include <sys/param.h> 45 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 46 #include <string.h> /* strcmp */ 47 #include <signal.h> 48 #include <fcntl.h> 49 #include <sys/ioctl.h> 50 #include <sys/stat.h> 51 #include <sys/ttycom.h> /* TIOCNOTTY */ 52 #ifdef __cplusplus 53 #include <sysent.h> /* getdtablesize, open */ 54 #endif /* __cplusplus */ 55 #include <memory.h> 56 #include <sys/socket.h> 57 #include <netinet/in.h> 58 #include <syslog.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <rpcsvc/yp.h> 62 struct dom_binding {}; 63 #include <rpcsvc/ypclnt.h> 64 #include "yppasswdd_extern.h" 65 #include "yppasswd_private.h" 66 #include "ypxfr_extern.h" 67 68 #ifndef SIG_PF 69 #define SIG_PF void(*)(int) 70 #endif 71 72 #ifdef DEBUG 73 #define RPC_SVC_FG 74 #endif 75 76 #define _RPCSVC_CLOSEDOWN 120 77 int _rpcpmstart = 0; /* Started by a port monitor ? */ 78 static int _rpcfdtype; 79 /* Whether Stream or Datagram ? */ 80 /* States a server can be in wrt request */ 81 82 #define _IDLE 0 83 #define _SERVED 1 84 #define _SERVING 2 85 86 extern int _rpcsvcstate; /* Set when a request is serviced */ 87 char *progname = "rpc.yppasswdd"; 88 char *yp_dir = _PATH_YP; 89 char *passfile_default = _PATH_YP "master.passwd"; 90 char *passfile; 91 char *yppasswd_domain = NULL; 92 int no_chsh = 0; 93 int no_chfn = 0; 94 int allow_additions = 0; 95 int multidomain = 0; 96 int verbose = 0; 97 int resvport = 1; 98 int inplace = 0; 99 char *sockname = YP_SOCKNAME; 100 101 static void terminate(sig) 102 int sig; 103 { 104 svc_unregister(YPPASSWDPROG, YPPASSWDVERS); 105 svc_unregister(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS); 106 unlink(sockname); 107 exit(0); 108 } 109 110 static void reload(sig) 111 int sig; 112 { 113 load_securenets(); 114 } 115 116 static void 117 closedown(int sig) 118 { 119 if (_rpcsvcstate == _IDLE) { 120 extern fd_set svc_fdset; 121 static int size; 122 int i, openfd; 123 124 if (_rpcfdtype == SOCK_DGRAM) { 125 unlink(sockname); 126 exit(0); 127 } 128 if (size == 0) { 129 size = getdtablesize(); 130 } 131 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 132 if (FD_ISSET(i, &svc_fdset)) 133 openfd++; 134 if (openfd <= 1) { 135 unlink(sockname); 136 exit(0); 137 } 138 } 139 if (_rpcsvcstate == _SERVED) 140 _rpcsvcstate = _IDLE; 141 142 (void) signal(SIGALRM, (SIG_PF) closedown); 143 (void) alarm(_RPCSVC_CLOSEDOWN/2); 144 } 145 146 static void usage() 147 { 148 fprintf(stderr, "%s\n%s\n", 149 "usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]", 150 " [-f] [-m] [-i] [-a] [-v] [-u] [-h]"); 151 exit(1); 152 } 153 154 int 155 main(argc, argv) 156 int argc; 157 char *argv[]; 158 { 159 register SVCXPRT *transp = NULL; 160 int sock; 161 int proto = 0; 162 struct sockaddr_in saddr; 163 int asize = sizeof (saddr); 164 int ch; 165 char *mastername; 166 char myname[MAXHOSTNAMELEN + 2]; 167 extern int errno; 168 extern int debug; 169 170 debug = 1; 171 172 while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) { 173 switch(ch) { 174 case 't': 175 passfile_default = optarg; 176 break; 177 case 'd': 178 yppasswd_domain = optarg; 179 break; 180 case 's': 181 no_chsh++; 182 break; 183 case 'f': 184 no_chfn++; 185 break; 186 case 'p': 187 yp_dir = optarg; 188 break; 189 case 'a': 190 allow_additions++; 191 break; 192 case 'm': 193 multidomain++; 194 break; 195 case 'i': 196 inplace++; 197 break; 198 case 'v': 199 verbose++; 200 break; 201 case 'u': 202 resvport = 0; 203 break; 204 default: 205 case 'h': 206 usage(); 207 break; 208 } 209 } 210 211 if (yppasswd_domain == NULL) { 212 if (yp_get_default_domain(&yppasswd_domain)) { 213 yp_error("no domain specified and system domain \ 214 name isn't set -- aborting"); 215 usage(); 216 } 217 } 218 219 load_securenets(); 220 221 if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) { 222 yp_error("no ypserv processes registered with local portmap"); 223 yp_error("this host is not an NIS server -- aborting"); 224 exit(1); 225 } 226 227 if ((mastername = ypxfr_get_master(yppasswd_domain, "passwd.byname", 228 "localhost",0)) == NULL) { 229 yp_error("can't get name of NIS master server for domain %s", 230 yppasswd_domain); 231 exit(1); 232 } 233 234 if (gethostname((char *)&myname, sizeof(myname)) == -1) { 235 yp_error("can't get local hostname: %s", strerror(errno)); 236 exit(1); 237 } 238 239 if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) { 240 yp_error("master of %s is %s, but we are %s", 241 "passwd.byname", mastername, myname); 242 yp_error("this host is not the NIS master server for \ 243 the %s domain -- aborting", yppasswd_domain); 244 exit(1); 245 } 246 247 debug = 0; 248 249 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 250 int ssize = sizeof (int); 251 252 if (saddr.sin_family != AF_INET) 253 exit(1); 254 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 255 (char *)&_rpcfdtype, &ssize) == -1) 256 exit(1); 257 sock = 0; 258 _rpcpmstart = 1; 259 proto = 0; 260 openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON); 261 } else { 262 if (!debug) { 263 if (daemon(0,0)) { 264 err(1,"cannot fork"); 265 } 266 } 267 openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON); 268 sock = RPC_ANYSOCK; 269 (void) pmap_unset(YPPASSWDPROG, YPPASSWDVERS); 270 (void) pmap_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS); 271 unlink(sockname); 272 } 273 274 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) { 275 transp = svcudp_create(sock); 276 if (transp == NULL) { 277 yp_error("cannot create udp service."); 278 exit(1); 279 } 280 if (!_rpcpmstart) 281 proto = IPPROTO_UDP; 282 if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) { 283 yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, udp)."); 284 exit(1); 285 } 286 } 287 288 if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) { 289 transp = svctcp_create(sock, 0, 0); 290 if (transp == NULL) { 291 yp_error("cannot create tcp service."); 292 exit(1); 293 } 294 if (!_rpcpmstart) 295 proto = IPPROTO_TCP; 296 if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) { 297 yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, tcp)."); 298 exit(1); 299 } 300 } 301 302 unlink(sockname); 303 transp = svcunix_create(sock, 0, 0, sockname); 304 if (transp == NULL) { 305 yp_error("cannot create AF_LOCAL service."); 306 exit(1); 307 } 308 if (!svc_register(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, master_yppasswdprog_1, 0)) { 309 yp_error("unable to register (MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, unix)."); 310 exit(1); 311 } 312 /* Only root may connect() to the AF_UNIX link. */ 313 if (chmod(sockname, 0)) 314 err(1, "chmod of %s failed", sockname); 315 316 if (transp == (SVCXPRT *)NULL) { 317 yp_error("could not create a handle"); 318 exit(1); 319 } 320 if (_rpcpmstart) { 321 (void) signal(SIGALRM, (SIG_PF) closedown); 322 (void) alarm(_RPCSVC_CLOSEDOWN/2); 323 } 324 /* set up resource limits and block signals */ 325 pw_init(); 326 327 /* except SIGCHLD, which we need to catch */ 328 install_reaper(1); 329 signal(SIGTERM, (SIG_PF) terminate); 330 331 signal(SIGHUP, (SIG_PF) reload); 332 333 svc_run(); 334 yp_error("svc_run returned"); 335 exit(1); 336 /* NOTREACHED */ 337 } 338