usr.sbin/rpc.ypupdated/ypupdated_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.ypupdated/ypupdated_main.c,v 1.4.2.3 2002/02/15 00:46:58 des Exp $
  33  * $DragonFly: src/usr.sbin/rpc.ypupdated/ypupdated_main.c,v 1.5 2005/11/25 00:32:49 swildner Exp $
  34  */
  35
  36 #include "ypupdate_prot.h"
  37 #include <stdio.h>
  38 #include <stdlib.h> /* getenv, exit */
  39 #include <rpc/pmap_clnt.h> /* for pmap_unset */
  40 #include <string.h> /* strcmp */
  41 #include <signal.h>
  42 #ifdef __cplusplus
  43 #include <sysent.h> /* getdtablesize, open */
  44 #endif /* __cplusplus */
  45 #include <memory.h>
  46 #include <sys/socket.h>
  47 #include <netinet/in.h>
  48 #include <syslog.h>
  49 #include <sys/wait.h>
  50 #include <errno.h>
  51 #include <err.h>
  52 #include <stdlib.h>
  53 #include <unistd.h>
  54 #include "ypupdated_extern.h"
  55 #include "yp_extern.h"
  56
  57 #ifndef SIG_PF
  58 #define SIG_PF void(*)(int)
  59 #endif
  60
  61 #ifdef DEBUG
  62 #define RPC_SVC_FG
  63 #endif
  64
  65 #define _RPCSVC_CLOSEDOWN 120
  66 int _rpcpmstart;                /* Started by a port monitor ? */
  67 static int _rpcfdtype;
  68                  /* Whether Stream or Datagram ? */
  69         /* States a server can be in wrt request */
  70
  71 #define _IDLE 0
  72 #define _SERVED 1
  73 #define _SERVING 2
  74
  75 extern int _rpcsvcstate;         /* Set when a request is serviced */
  76
  77 char *progname = "rpc.ypupdated";
  78 char *yp_dir = "/var/yp/";
  79
  80 static void
  81 _msgout(char *msg)
  82 {
  83 #ifdef RPC_SVC_FG
  84         if (_rpcpmstart)
  85                 syslog(LOG_ERR, "%s", msg);
  86         else
  87                 warnx("%s", msg);
  88 #else
  89         syslog(LOG_ERR, "%s", msg);
  90 #endif
  91 }
  92
  93 static void
  94 closedown(int sig)
  95 {
  96         if (_rpcsvcstate == _IDLE) {
  97                 extern fd_set svc_fdset;
  98                 static int size;
  99                 int i, openfd;
 100
 101                 if (_rpcfdtype == SOCK_DGRAM)
 102                         exit(0);
 103                 if (size == 0) {
 104                         size = getdtablesize();
 105                 }
 106                 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
 107                         if (FD_ISSET(i, &svc_fdset))
 108                                 openfd++;
 109                 if (openfd <= 1)
 110                         exit(0);
 111         }
 112         if (_rpcsvcstate == _SERVED)
 113                 _rpcsvcstate = _IDLE;
 114
 115         signal(SIGALRM, (SIG_PF) closedown);
 116         alarm(_RPCSVC_CLOSEDOWN/2);
 117 }
 118
 119 static void
 120 ypupdated_svc_run(void)
 121 {
 122 #ifdef FD_SETSIZE
 123         fd_set readfds;
 124 #else
 125         int readfds;
 126 #endif /* def FD_SETSIZE */
 127         extern int forked;
 128         int pid;
 129         int fd_setsize = _rpc_dtablesize();
 130
 131         /* Establish the identity of the parent ypupdated process. */
 132         pid = getpid();
 133
 134         for (;;) {
 135 #ifdef FD_SETSIZE
 136                 readfds = svc_fdset;
 137 #else
 138                 readfds = svc_fds;
 139 #endif /* def FD_SETSIZE */
 140                 switch (select(fd_setsize, &readfds, NULL, NULL,
 141                                (struct timeval *)0)) {
 142                 case -1:
 143                         if (errno == EINTR) {
 144                                 continue;
 145                         }
 146                         warn("svc_run: - select failed");
 147                         return;
 148                 case 0:
 149                         continue;
 150                 default:
 151                         svc_getreqset(&readfds);
 152                         if (forked && pid != getpid())
 153                                 exit(0);
 154                 }
 155         }
 156 }
 157
 158 static void
 159 reaper(int sig)
 160 {
 161         int status;
 162
 163         if (sig == SIGHUP) {
 164 #ifdef foo
 165                 load_securenets();
 166 #endif
 167                 return;
 168         }
 169
 170         if (sig == SIGCHLD) {
 171                 while (wait3(&status, WNOHANG, NULL) > 0)
 172                         children--;
 173         } else {
 174                 pmap_unset(YPU_PROG, YPU_VERS);
 175                 exit(0);
 176         }
 177 }
 178
 179 void
 180 usage(void)
 181 {
 182         fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
 183         exit(0);
 184 }
 185
 186 int
 187 main(int argc, char *argv[])
 188 {
 189         SVCXPRT *transp = NULL;
 190         int sock;
 191         int proto = 0;
 192         struct sockaddr_in saddr;
 193         int asize = sizeof (saddr);
 194         int ch;
 195
 196         while ((ch = getopt(argc, argv, "p:h")) != -1) {
 197                 switch (ch) {
 198                 case 'p':
 199                         yp_dir = optarg;
 200                         break;
 201                 default:
 202                         usage();
 203                         break;
 204                 }
 205         }
 206 #ifdef foo
 207         load_securenets();
 208 #endif
 209
 210         if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
 211                 yp_error("failed to register AUTH_DES flavor");
 212                 exit(1);
 213         }
 214
 215         if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
 216                 int ssize = sizeof (int);
 217
 218                 if (saddr.sin_family != AF_INET)
 219                         exit(1);
 220                 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
 221                                 (char *)&_rpcfdtype, &ssize) == -1)
 222                         exit(1);
 223                 sock = 0;
 224                 _rpcpmstart = 1;
 225                 proto = 0;
 226                 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
 227         } else {
 228 #ifndef RPC_SVC_FG
 229                 if (daemon(0,0)) {
 230                         err(1, "cannot fork");
 231                 }
 232                 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
 233 #endif
 234                 sock = RPC_ANYSOCK;
 235                 pmap_unset(YPU_PROG, YPU_VERS);
 236         }
 237
 238         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
 239                 transp = svcudp_create(sock);
 240                 if (transp == NULL) {
 241                         _msgout("cannot create udp service.");
 242                         exit(1);
 243                 }
 244                 if (!_rpcpmstart)
 245                         proto = IPPROTO_UDP;
 246                 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
 247                         _msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
 248                         exit(1);
 249                 }
 250         }
 251
 252         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
 253                 transp = svctcp_create(sock, 0, 0);
 254                 if (transp == NULL) {
 255                         _msgout("cannot create tcp service.");
 256                         exit(1);
 257                 }
 258                 if (!_rpcpmstart)
 259                         proto = IPPROTO_TCP;
 260                 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
 261                         _msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
 262                         exit(1);
 263                 }
 264         }
 265
 266         if (transp == (SVCXPRT *)NULL) {
 267                 _msgout("could not create a handle");
 268                 exit(1);
 269         }
 270         if (_rpcpmstart) {
 271                 signal(SIGALRM, (SIG_PF) closedown);
 272                 alarm(_RPCSVC_CLOSEDOWN/2);
 273         }
 274
 275         signal(SIGPIPE, SIG_IGN);
 276         signal(SIGCHLD, (SIG_PF) reaper);
 277         signal(SIGTERM, (SIG_PF) reaper);
 278         signal(SIGINT, (SIG_PF) reaper);
 279         signal(SIGHUP, (SIG_PF) reaper);
 280
 281         ypupdated_svc_run();
 282         _msgout("svc_run returned");
 283         exit(1);
 284         /* NOTREACHED */
 285 }