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
  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>
  52 #include <string.h> /* strcmp */
  53 #include <syslog.h>
  54 #include <unistd.h>
  55
  56 #include <rpc/rpc.h>
  57 #include <rpc/rpc_com.h>
  58 #include <rpc/pmap_clnt.h> /* for pmap_unset */
  59 #include <rpcsvc/yp.h>
  60 #include <rpcsvc/ypclnt.h>
  61
  62 #include "yppasswd.h"
  63 #include "yppasswdd_extern.h"
  64 #include "yppasswd_private.h"
  65 #include "ypxfr_extern.h"
  66 #include "yp_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 static char _localhost[] = "localhost";
  87 static char _passwd_byname[] = "passwd.byname";
  88 extern int _rpcsvcstate;         /* Set when a request is serviced */
  89 static char _progname[] = "rpc.yppasswdd";
  90 char *progname = _progname;
  91 static char _yp_dir[] = _PATH_YP;
  92 char *yp_dir = _yp_dir;
  93 static char _passfile_default[] = _PATH_YP "master.passwd";
  94 char *passfile_default = _passfile_default;
  95 char *passfile;
  96 char *yppasswd_domain = NULL;
  97 int no_chsh = 0;
  98 int no_chfn = 0;
  99 int allow_additions = 0;
 100 int multidomain = 0;
 101 int verbose = 0;
 102 int resvport = 1;
 103 int inplace = 0;
 104 char sockname[] = YP_SOCKNAME;
 105
 106 static void
 107 terminate(int sig __unused)
 108 {
 109         rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
 110         rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
 111         unlink(sockname);
 112         exit(0);
 113 }
 114
 115 static void
 116 reload(int sig __unused)
 117 {
 118         load_securenets();
 119 }
 120
 121 static void
 122 closedown(int sig __unused)
 123 {
 124         if (_rpcsvcstate == _IDLE) {
 125                 extern fd_set svc_fdset;
 126                 static int size;
 127                 int i, openfd;
 128
 129                 if (_rpcfdtype == SOCK_DGRAM) {
 130                         unlink(sockname);
 131                         exit(0);
 132                 }
 133                 if (size == 0) {
 134                         size = getdtablesize();
 135                 }
 136                 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
 137                         if (FD_ISSET(i, &svc_fdset))
 138                                 openfd++;
 139                 if (openfd <= 1) {
 140                         unlink(sockname);
 141                         exit(0);
 142                 }
 143         }
 144         if (_rpcsvcstate == _SERVED)
 145                 _rpcsvcstate = _IDLE;
 146
 147         (void) signal(SIGALRM, (SIG_PF) closedown);
 148         (void) alarm(_RPCSVC_CLOSEDOWN/2);
 149 }
 150
 151 static void
 152 usage(void)
 153 {
 154         fprintf(stderr, "%s\n%s\n",
 155 "usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]",
 156 "                     [-f] [-m] [-i] [-a] [-v] [-u] [-h]");
 157         exit(1);
 158 }
 159
 160 int
 161 main(int argc, char *argv[])
 162 {
 163         struct rlimit rlim;
 164         SVCXPRT *transp = NULL;
 165         struct sockaddr_in saddr;
 166         socklen_t asize = sizeof (saddr);
 167         struct netconfig *nconf;
 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
 272         rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
 273         rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
 274
 275         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 276
 277         if (svc_create(yppasswdprog_1, YPPASSWDPROG, YPPASSWDVERS, "netpath") == 0) {
 278                 yp_error("cannot create yppasswd service.");
 279                 exit(1);
 280         }
 281         if (svc_create(master_yppasswdprog_1, MASTER_YPPASSWDPROG,
 282             MASTER_YPPASSWDVERS, "netpath") == 0) {
 283                 yp_error("cannot create master_yppasswd service.");
 284                 exit(1);
 285         }
 286
 287         nconf = NULL;
 288         localhandle = setnetconfig();
 289         while ((nconf = getnetconfig(localhandle)) != NULL) {
 290                 if (nconf->nc_protofmly != NULL &&
 291                     strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
 292                         break;
 293         }
 294         if (nconf == NULL) {
 295                 yp_error("getnetconfigent unix: %s", nc_sperror());
 296                 exit(1);
 297         }
 298         unlink(sockname);
 299         transp = svcunix_create(RPC_ANYSOCK, 0, 0, sockname);
 300         if (transp == NULL) {
 301                 yp_error("cannot create AF_LOCAL service.");
 302                 exit(1);
 303         }
 304         if (!svc_reg(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS,
 305             master_yppasswdprog_1, nconf)) {
 306                 yp_error("unable to register (MASTER_YPPASSWDPROG, \
 307                     MASTER_YPPASSWDVERS, unix).");
 308                 exit(1);
 309         }
 310         endnetconfig(localhandle);
 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
 325         /* Unlimited resource limits. */
 326         rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
 327         (void)setrlimit(RLIMIT_CPU, &rlim);
 328         (void)setrlimit(RLIMIT_FSIZE, &rlim);
 329         (void)setrlimit(RLIMIT_STACK, &rlim);
 330         (void)setrlimit(RLIMIT_DATA, &rlim);
 331         (void)setrlimit(RLIMIT_RSS, &rlim);
 332
 333         /* Don't drop core (not really necessary, but GP's). */
 334         rlim.rlim_cur = rlim.rlim_max = 0;
 335         (void)setrlimit(RLIMIT_CORE, &rlim);
 336
 337         /* Turn off signals. */
 338         (void)signal(SIGALRM, SIG_IGN);
 339         (void)signal(SIGHUP, (SIG_PF) reload);
 340         (void)signal(SIGINT, SIG_IGN);
 341         (void)signal(SIGPIPE, SIG_IGN);
 342         (void)signal(SIGQUIT, SIG_IGN);
 343         (void)signal(SIGTERM, (SIG_PF) terminate);
 344
 345         svc_run();
 346         yp_error("svc_run returned");
 347         exit(1);
 348         /* NOTREACHED */
 349 }