usr.sbin/rpc.yppasswdd/yppasswdd_main.c

   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  * $FreeBSD: src/usr.sbin/rpc.yppasswdd/yppasswdd_main.c,v 1.14.2.2 2002/02/15 00:46:57 des Exp $
  33  * $DragonFly: src/usr.sbin/rpc.yppasswdd/yppasswdd_main.c,v 1.5 2005/11/25 00:32:49 swildner Exp $
  34  */
  35
  36 #include "yppasswd.h"
  37 #include <stdio.h>
  38 #include <sys/types.h>
  39 #include <stdlib.h> /* getenv, exit */
  40 #include <unistd.h>
  41 #include <string.h>
  42 #include <sys/param.h>
  43 #include <rpc/pmap_clnt.h> /* for pmap_unset */
  44 #include <string.h> /* strcmp */
  45 #include <signal.h>
  46 #include <fcntl.h>
  47 #include <sys/ioctl.h>
  48 #include <sys/stat.h>
  49 #ifdef __cplusplus
  50 #include <sysent.h> /* getdtablesize, open */
  51 #endif /* __cplusplus */
  52 #include <memory.h>
  53 #include <sys/socket.h>
  54 #include <netinet/in.h>
  55 #include <syslog.h>
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <rpcsvc/yp.h>
  59 struct dom_binding {};
  60 #include <rpcsvc/ypclnt.h>
  61 #include "yppasswdd_extern.h"
  62 #include "yppasswd_private.h"
  63 #include "ypxfr_extern.h"
  64
  65 #ifndef SIG_PF
  66 #define SIG_PF void(*)(int)
  67 #endif
  68
  69 #ifdef DEBUG
  70 #define RPC_SVC_FG
  71 #endif
  72
  73 #define _RPCSVC_CLOSEDOWN 120
  74 int _rpcpmstart = 0;            /* Started by a port monitor ? */
  75 static int _rpcfdtype;
  76                  /* Whether Stream or Datagram ? */
  77         /* States a server can be in wrt request */
  78
  79 #define _IDLE 0
  80 #define _SERVED 1
  81 #define _SERVING 2
  82
  83 extern int _rpcsvcstate;         /* Set when a request is serviced */
  84 char *progname = "rpc.yppasswdd";
  85 char *yp_dir = _PATH_YP;
  86 char *passfile_default = _PATH_YP "master.passwd";
  87 char *passfile;
  88 char *yppasswd_domain = NULL;
  89 int no_chsh = 0;
  90 int no_chfn = 0;
  91 int allow_additions = 0;
  92 int multidomain = 0;
  93 int verbose = 0;
  94 int resvport = 1;
  95 int inplace = 0;
  96 char *sockname = YP_SOCKNAME;
  97
  98 static void
  99 terminate(int sig)
 100 {
 101         svc_unregister(YPPASSWDPROG, YPPASSWDVERS);
 102         svc_unregister(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS);
 103         unlink(sockname);
 104         exit(0);
 105 }
 106
 107 static void
 108 reload(int sig)
 109 {
 110         load_securenets();
 111 }
 112
 113 static void
 114 closedown(int sig)
 115 {
 116         if (_rpcsvcstate == _IDLE) {
 117                 extern fd_set svc_fdset;
 118                 static int size;
 119                 int i, openfd;
 120
 121                 if (_rpcfdtype == SOCK_DGRAM) {
 122                         unlink(sockname);
 123                         exit(0);
 124                 }
 125                 if (size == 0) {
 126                         size = getdtablesize();
 127                 }
 128                 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
 129                         if (FD_ISSET(i, &svc_fdset))
 130                                 openfd++;
 131                 if (openfd <= 1) {
 132                         unlink(sockname);
 133                         exit(0);
 134                 }
 135         }
 136         if (_rpcsvcstate == _SERVED)
 137                 _rpcsvcstate = _IDLE;
 138
 139         signal(SIGALRM, (SIG_PF) closedown);
 140         alarm(_RPCSVC_CLOSEDOWN/2);
 141 }
 142
 143 static void usage(void)
 144 {
 145         fprintf(stderr, "%s\n%s\n",
 146 "usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]",
 147 "                     [-f] [-m] [-i] [-a] [-v] [-u] [-h]");
 148         exit(1);
 149 }
 150
 151 int
 152 main(int argc, char *argv[])
 153 {
 154         SVCXPRT *transp = NULL;
 155         int sock;
 156         int proto = 0;
 157         struct sockaddr_in saddr;
 158         int asize = sizeof (saddr);
 159         int ch;
 160         char *mastername;
 161         char myname[MAXHOSTNAMELEN + 2];
 162         extern int debug;
 163
 164         debug = 1;
 165
 166         while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) {
 167                 switch (ch) {
 168                 case 't':
 169                         passfile_default = optarg;
 170                         break;
 171                 case 'd':
 172                         yppasswd_domain = optarg;
 173                         break;
 174                 case 's':
 175                         no_chsh++;
 176                         break;
 177                 case 'f':
 178                         no_chfn++;
 179                         break;
 180                 case 'p':
 181                         yp_dir = optarg;
 182                         break;
 183                 case 'a':
 184                         allow_additions++;
 185                         break;
 186                 case 'm':
 187                         multidomain++;
 188                         break;
 189                 case 'i':
 190                         inplace++;
 191                         break;
 192                 case 'v':
 193                         verbose++;
 194                         break;
 195                 case 'u':
 196                         resvport = 0;
 197                         break;
 198                 default:
 199                 case 'h':
 200                         usage();
 201                         break;
 202                 }
 203         }
 204
 205         if (yppasswd_domain == NULL) {
 206                 if (yp_get_default_domain(&yppasswd_domain)) {
 207                         yp_error("no domain specified and system domain \
 208 name isn't set -- aborting");
 209                 usage();
 210                 }
 211         }
 212
 213         load_securenets();
 214
 215         if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
 216                 yp_error("no ypserv processes registered with local portmap");
 217                 yp_error("this host is not an NIS server -- aborting");
 218                 exit(1);
 219         }
 220
 221         if ((mastername = ypxfr_get_master(yppasswd_domain, "passwd.byname",
 222                                                 "localhost",0)) == NULL) {
 223                 yp_error("can't get name of NIS master server for domain %s",
 224                                                         yppasswd_domain);
 225                 exit(1);
 226         }
 227
 228         if (gethostname((char *)&myname, sizeof(myname)) == -1) {
 229                 yp_error("can't get local hostname: %s", strerror(errno));
 230                 exit(1);
 231         }
 232
 233         if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) {
 234                 yp_error("master of %s is %s, but we are %s",
 235                         "passwd.byname", mastername, myname);
 236                 yp_error("this host is not the NIS master server for \
 237 the %s domain -- aborting", yppasswd_domain);
 238                 exit(1);
 239         }
 240
 241         debug = 0;
 242
 243         if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
 244                 int ssize = sizeof (int);
 245
 246                 if (saddr.sin_family != AF_INET)
 247                         exit(1);
 248                 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
 249                                 (char *)&_rpcfdtype, &ssize) == -1)
 250                         exit(1);
 251                 sock = 0;
 252                 _rpcpmstart = 1;
 253                 proto = 0;
 254                 openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
 255         } else {
 256                 if (!debug) {
 257                         if (daemon(0,0)) {
 258                                 err(1,"cannot fork");
 259                         }
 260                 }
 261                 openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
 262                 sock = RPC_ANYSOCK;
 263                 pmap_unset(YPPASSWDPROG, YPPASSWDVERS);
 264                 pmap_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS);
 265                 unlink(sockname);
 266         }
 267
 268         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
 269                 transp = svcudp_create(sock);
 270                 if (transp == NULL) {
 271                         yp_error("cannot create udp service.");
 272                         exit(1);
 273                 }
 274                 if (!_rpcpmstart)
 275                         proto = IPPROTO_UDP;
 276                 if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
 277                         yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, udp).");
 278                         exit(1);
 279                 }
 280         }
 281
 282         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
 283                 transp = svctcp_create(sock, 0, 0);
 284                 if (transp == NULL) {
 285                         yp_error("cannot create tcp service.");
 286                         exit(1);
 287                 }
 288                 if (!_rpcpmstart)
 289                         proto = IPPROTO_TCP;
 290                 if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
 291                         yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, tcp).");
 292                         exit(1);
 293                 }
 294         }
 295
 296         unlink(sockname);
 297         transp = svcunix_create(sock, 0, 0, sockname);
 298         if (transp == NULL) {
 299                 yp_error("cannot create AF_LOCAL service.");
 300                 exit(1);
 301         }
 302         if (!svc_register(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, master_yppasswdprog_1, 0)) {
 303                 yp_error("unable to register (MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, unix).");
 304                 exit(1);
 305         }
 306         /* Only root may connect() to the AF_UNIX link. */
 307         if (chmod(sockname, 0))
 308                 err(1, "chmod of %s failed", sockname);
 309
 310         if (transp == (SVCXPRT *)NULL) {
 311                 yp_error("could not create a handle");
 312                 exit(1);
 313         }
 314         if (_rpcpmstart) {
 315                 signal(SIGALRM, (SIG_PF) closedown);
 316                 alarm(_RPCSVC_CLOSEDOWN/2);
 317         }
 318         /* set up resource limits and block signals */
 319         pw_init();
 320
 321         /* except SIGCHLD, which we need to catch */
 322         install_reaper(1);
 323         signal(SIGTERM, (SIG_PF) terminate);
 324
 325         signal(SIGHUP, (SIG_PF) reload);
 326
 327         svc_run();
 328         yp_error("svc_run returned");
 329         exit(1);
 330         /* NOTREACHED */
 331 }