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 1.27 2008/10/30 01:54:31 rafan 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 <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 const 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         signal(SIGALRM, (SIG_PF) closedown);
 148         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         struct sigaction sa;
 169         void *localhandle;
 170         int ch;
 171         char *mastername;
 172         char myname[MAXHOSTNAMELEN + 2];
 173         int maxrec = RPC_MAXDATASIZE;
 174
 175         extern int debug;
 176
 177         debug = 1;
 178
 179         while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) {
 180                 switch (ch) {
 181                 case 't':
 182                         passfile_default = optarg;
 183                         break;
 184                 case 'd':
 185                         yppasswd_domain = optarg;
 186                         break;
 187                 case 's':
 188                         no_chsh++;
 189                         break;
 190                 case 'f':
 191                         no_chfn++;
 192                         break;
 193                 case 'p':
 194                         yp_dir = optarg;
 195                         break;
 196                 case 'a':
 197                         allow_additions++;
 198                         break;
 199                 case 'm':
 200                         multidomain++;
 201                         break;
 202                 case 'i':
 203                         inplace++;
 204                         break;
 205                 case 'v':
 206                         verbose++;
 207                         break;
 208                 case 'u':
 209                         resvport = 0;
 210                         break;
 211                 default:
 212                 case 'h':
 213                         usage();
 214                         break;
 215                 }
 216         }
 217
 218         if (yppasswd_domain == NULL) {
 219                 if (yp_get_default_domain(&yppasswd_domain)) {
 220                         yp_error("no domain specified and system domain \
 221 name isn't set -- aborting");
 222                 usage();
 223                 }
 224         }
 225
 226         load_securenets();
 227
 228         if (getrpcport(_localhost, YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
 229                 yp_error("no ypserv processes registered with local portmap");
 230                 yp_error("this host is not an NIS server -- aborting");
 231                 exit(1);
 232         }
 233
 234         if ((mastername = ypxfr_get_master(yppasswd_domain,
 235                  _passwd_byname, _localhost, 0)) == NULL) {
 236                 yp_error("can't get name of NIS master server for domain %s",
 237                                                         yppasswd_domain);
 238                 exit(1);
 239         }
 240
 241         if (gethostname((char *)&myname, sizeof(myname)) == -1) {
 242                 yp_error("can't get local hostname: %s", strerror(errno));
 243                 exit(1);
 244         }
 245
 246         if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) {
 247                 yp_error("master of %s is %s, but we are %s",
 248                         "passwd.byname", mastername, myname);
 249                 yp_error("this host is not the NIS master server for \
 250 the %s domain -- aborting", yppasswd_domain);
 251                 exit(1);
 252         }
 253
 254         debug = 0;
 255
 256         if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
 257                 socklen_t ssize = sizeof (int);
 258                 if (saddr.sin_family != AF_INET)
 259                         exit(1);
 260                 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
 261                     (char *)&_rpcfdtype, &ssize) == -1)
 262                         exit(1);
 263                 _rpcpmstart = 1;
 264         }
 265
 266         if (!debug && _rpcpmstart == 0) {
 267                 if (daemon(0,0)) {
 268                         err(1,"cannot fork");
 269                 }
 270         }
 271         openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
 272         memset(&sa, 0, sizeof(sa));
 273         sa.sa_flags = SA_NOCLDWAIT;
 274         sigaction(SIGCHLD, &sa, NULL);
 275
 276         rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
 277         rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
 278
 279         rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec);
 280
 281         if (svc_create(yppasswdprog_1, YPPASSWDPROG, YPPASSWDVERS, "netpath") == 0) {
 282                 yp_error("cannot create yppasswd service.");
 283                 exit(1);
 284         }
 285         if (svc_create(master_yppasswdprog_1, MASTER_YPPASSWDPROG,
 286             MASTER_YPPASSWDVERS, "netpath") == 0) {
 287                 yp_error("cannot create master_yppasswd service.");
 288                 exit(1);
 289         }
 290
 291         nconf = NULL;
 292         localhandle = setnetconfig();
 293         while ((nconf = getnetconfig(localhandle)) != NULL) {
 294                 if (nconf->nc_protofmly != NULL &&
 295                     strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
 296                         break;
 297         }
 298         if (nconf == NULL) {
 299                 yp_error("getnetconfigent unix: %s", nc_sperror());
 300                 exit(1);
 301         }
 302         unlink(sockname);
 303         transp = svcunix_create(RPC_ANYSOCK, 0, 0, sockname);
 304         if (transp == NULL) {
 305                 yp_error("cannot create AF_LOCAL service.");
 306                 exit(1);
 307         }
 308         if (!svc_reg(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS,
 309             master_yppasswdprog_1, nconf)) {
 310                 yp_error("unable to register (MASTER_YPPASSWDPROG, \
 311                     MASTER_YPPASSWDVERS, unix).");
 312                 exit(1);
 313         }
 314         endnetconfig(localhandle);
 315
 316         /* Only root may connect() to the AF_UNIX link. */
 317         if (chmod(sockname, 0))
 318                 err(1, "chmod of %s failed", sockname);
 319
 320         if (transp == NULL) {
 321                 yp_error("could not create a handle");
 322                 exit(1);
 323         }
 324         if (_rpcpmstart) {
 325                 signal(SIGALRM, (SIG_PF) closedown);
 326                 alarm(_RPCSVC_CLOSEDOWN/2);
 327         }
 328
 329         /* Unlimited resource limits. */
 330         rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
 331         setrlimit(RLIMIT_CPU, &rlim);
 332         setrlimit(RLIMIT_FSIZE, &rlim);
 333         setrlimit(RLIMIT_STACK, &rlim);
 334         setrlimit(RLIMIT_DATA, &rlim);
 335         setrlimit(RLIMIT_RSS, &rlim);
 336
 337         /* Don't drop core (not really necessary, but GP's). */
 338         rlim.rlim_cur = rlim.rlim_max = 0;
 339         setrlimit(RLIMIT_CORE, &rlim);
 340
 341         /* Turn off signals. */
 342         signal(SIGALRM, SIG_IGN);
 343         signal(SIGHUP, (SIG_PF) reload);
 344         signal(SIGINT, SIG_IGN);
 345         signal(SIGPIPE, SIG_IGN);
 346         signal(SIGQUIT, SIG_IGN);
 347         signal(SIGTERM, (SIG_PF) terminate);
 348
 349         svc_run();
 350         yp_error("svc_run returned");
 351         exit(1);
 352         /* NOTREACHED */
 353 }