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 1.10 2004/05/24 12:28:27 stefanf Exp $
  33  */
  34
  35 #include "ypupdate_prot.h"
  36 #include <stdio.h>
  37 #include <stdlib.h> /* getenv, exit */
  38 #include <rpc/pmap_clnt.h> /* for pmap_unset */
  39 #include <rpc/rpc_com.h>
  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 <unistd.h>
  53 #include "ypupdated_extern.h"
  54 #include "yp_extern.h"
  55
  56 #ifndef SIG_PF
  57 #define SIG_PF void(*)(int)
  58 #endif
  59
  60 #ifdef DEBUG
  61 #define RPC_SVC_FG
  62 #endif
  63
  64 #define _RPCSVC_CLOSEDOWN 120
  65 int _rpcpmstart;                /* Started by a port monitor ? */
  66 static int _rpcfdtype;
  67                  /* Whether Stream or Datagram ? */
  68         /* States a server can be in wrt request */
  69
  70 #define _IDLE 0
  71 #define _SERVED 1
  72 #define _SERVING 2
  73
  74 extern int _rpcsvcstate;         /* Set when a request is serviced */
  75
  76 char *progname = "rpc.ypupdated";
  77 const char *yp_dir = "/var/yp/";
  78
  79 static void
  80 _msgout(char *msg)
  81 {
  82 #ifdef RPC_SVC_FG
  83         if (_rpcpmstart)
  84                 syslog(LOG_ERR, "%s", msg);
  85         else
  86                 warnx("%s", msg);
  87 #else
  88         syslog(LOG_ERR, "%s", msg);
  89 #endif
  90 }
  91
  92 static void
  93 closedown(int sig)
  94 {
  95         if (_rpcsvcstate == _IDLE) {
  96                 extern fd_set svc_fdset;
  97                 static int size;
  98                 int i, openfd;
  99
 100                 if (_rpcfdtype == SOCK_DGRAM)
 101                         exit(0);
 102                 if (size == 0) {
 103                         size = getdtablesize();
 104                 }
 105                 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
 106                         if (FD_ISSET(i, &svc_fdset))
 107                                 openfd++;
 108                 if (openfd <= 1)
 109                         exit(0);
 110         }
 111         if (_rpcsvcstate == _SERVED)
 112                 _rpcsvcstate = _IDLE;
 113
 114         signal(SIGALRM, (SIG_PF) closedown);
 115         alarm(_RPCSVC_CLOSEDOWN/2);
 116 }
 117
 118 static void
 119 ypupdated_svc_run(void)
 120 {
 121 #ifdef FD_SETSIZE
 122         fd_set readfds;
 123 #else
 124         int readfds;
 125 #endif /* def FD_SETSIZE */
 126         extern int forked;
 127         int pid;
 128         int fd_setsize = _rpc_dtablesize();
 129
 130         /* Establish the identity of the parent ypupdated process. */
 131         pid = getpid();
 132
 133         for (;;) {
 134 #ifdef FD_SETSIZE
 135                 readfds = svc_fdset;
 136 #else
 137                 readfds = svc_fds;
 138 #endif /* def FD_SETSIZE */
 139                 switch (select(fd_setsize, &readfds, NULL, NULL, NULL)) {
 140                 case -1:
 141                         if (errno == EINTR) {
 142                                 continue;
 143                         }
 144                         warn("svc_run: - select failed");
 145                         return;
 146                 case 0:
 147                         continue;
 148                 default:
 149                         svc_getreqset(&readfds);
 150                         if (forked && pid != getpid())
 151                                 exit(0);
 152                 }
 153         }
 154 }
 155
 156 static void
 157 reaper(int sig)
 158 {
 159         int status;
 160
 161         if (sig == SIGHUP) {
 162 #ifdef foo
 163                 load_securenets();
 164 #endif
 165                 return;
 166         }
 167
 168         if (sig == SIGCHLD) {
 169                 while (wait3(&status, WNOHANG, NULL) > 0)
 170                         children--;
 171         } else {
 172                 pmap_unset(YPU_PROG, YPU_VERS);
 173                 exit(0);
 174         }
 175 }
 176
 177 void
 178 usage(void)
 179 {
 180         fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
 181         exit(0);
 182 }
 183
 184 int
 185 main(int argc, char *argv[])
 186 {
 187         SVCXPRT *transp = NULL;
 188         int sock;
 189         int proto = 0;
 190         struct sockaddr_in saddr;
 191         int asize = sizeof (saddr);
 192         int ch;
 193
 194         while ((ch = getopt(argc, argv, "p:h")) != -1) {
 195                 switch (ch) {
 196                 case 'p':
 197                         yp_dir = optarg;
 198                         break;
 199                 default:
 200                         usage();
 201                         break;
 202                 }
 203         }
 204 #ifdef foo
 205         load_securenets();
 206 #endif
 207
 208         if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
 209                 yp_error("failed to register AUTH_DES flavor");
 210                 exit(1);
 211         }
 212
 213         if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
 214                 int ssize = sizeof (int);
 215
 216                 if (saddr.sin_family != AF_INET)
 217                         exit(1);
 218                 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
 219                                 (char *)&_rpcfdtype, &ssize) == -1)
 220                         exit(1);
 221                 sock = 0;
 222                 _rpcpmstart = 1;
 223                 proto = 0;
 224                 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
 225         } else {
 226 #ifndef RPC_SVC_FG
 227                 if (daemon(0,0)) {
 228                         err(1, "cannot fork");
 229                 }
 230                 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
 231 #endif
 232                 sock = RPC_ANYSOCK;
 233                 pmap_unset(YPU_PROG, YPU_VERS);
 234         }
 235
 236         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
 237                 transp = svcudp_create(sock);
 238                 if (transp == NULL) {
 239                         _msgout("cannot create udp service.");
 240                         exit(1);
 241                 }
 242                 if (!_rpcpmstart)
 243                         proto = IPPROTO_UDP;
 244                 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
 245                         _msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
 246                         exit(1);
 247                 }
 248         }
 249
 250         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
 251                 transp = svctcp_create(sock, 0, 0);
 252                 if (transp == NULL) {
 253                         _msgout("cannot create tcp service.");
 254                         exit(1);
 255                 }
 256                 if (!_rpcpmstart)
 257                         proto = IPPROTO_TCP;
 258                 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
 259                         _msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
 260                         exit(1);
 261                 }
 262         }
 263
 264         if (transp == NULL) {
 265                 _msgout("could not create a handle");
 266                 exit(1);
 267         }
 268         if (_rpcpmstart) {
 269                 signal(SIGALRM, (SIG_PF) closedown);
 270                 alarm(_RPCSVC_CLOSEDOWN/2);
 271         }
 272
 273         signal(SIGPIPE, SIG_IGN);
 274         signal(SIGCHLD, (SIG_PF) reaper);
 275         signal(SIGTERM, (SIG_PF) reaper);
 276         signal(SIGINT, (SIG_PF) reaper);
 277         signal(SIGHUP, (SIG_PF) reaper);
 278
 279         ypupdated_svc_run();
 280         _msgout("svc_run returned");
 281         exit(1);
 282         /* NOTREACHED */
 283 }