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  * $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 <rpc/rpc_com.h>
  41 #include <string.h> /* strcmp */
  42 #include <signal.h>
  43 #ifdef __cplusplus
  44 #include <sysent.h> /* getdtablesize, open */
  45 #endif /* __cplusplus */
  46 #include <memory.h>
  47 #include <sys/socket.h>
  48 #include <netinet/in.h>
  49 #include <syslog.h>
  50 #include <sys/wait.h>
  51 #include <errno.h>
  52 #include <err.h>
  53 #include <stdlib.h>
  54 #include <unistd.h>
  55 #include "ypupdated_extern.h"
  56 #include "yp_extern.h"
  57
  58 #ifndef SIG_PF
  59 #define SIG_PF void(*)(int)
  60 #endif
  61
  62 #ifdef DEBUG
  63 #define RPC_SVC_FG
  64 #endif
  65
  66 #define _RPCSVC_CLOSEDOWN 120
  67 int _rpcpmstart;                /* Started by a port monitor ? */
  68 static int _rpcfdtype;
  69                  /* Whether Stream or Datagram ? */
  70         /* States a server can be in wrt request */
  71
  72 #define _IDLE 0
  73 #define _SERVED 1
  74 #define _SERVING 2
  75
  76 extern int _rpcsvcstate;         /* Set when a request is serviced */
  77
  78 char *progname = "rpc.ypupdated";
  79 char *yp_dir = "/var/yp/";
  80
  81 static void
  82 _msgout(char *msg)
  83 {
  84 #ifdef RPC_SVC_FG
  85         if (_rpcpmstart)
  86                 syslog(LOG_ERR, "%s", msg);
  87         else
  88                 warnx("%s", msg);
  89 #else
  90         syslog(LOG_ERR, "%s", msg);
  91 #endif
  92 }
  93
  94 static void
  95 closedown(int sig)
  96 {
  97         if (_rpcsvcstate == _IDLE) {
  98                 extern fd_set svc_fdset;
  99                 static int size;
 100                 int i, openfd;
 101
 102                 if (_rpcfdtype == SOCK_DGRAM)
 103                         exit(0);
 104                 if (size == 0) {
 105                         size = getdtablesize();
 106                 }
 107                 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
 108                         if (FD_ISSET(i, &svc_fdset))
 109                                 openfd++;
 110                 if (openfd <= 1)
 111                         exit(0);
 112         }
 113         if (_rpcsvcstate == _SERVED)
 114                 _rpcsvcstate = _IDLE;
 115
 116         signal(SIGALRM, (SIG_PF) closedown);
 117         alarm(_RPCSVC_CLOSEDOWN/2);
 118 }
 119
 120 static void
 121 ypupdated_svc_run(void)
 122 {
 123 #ifdef FD_SETSIZE
 124         fd_set readfds;
 125 #else
 126         int readfds;
 127 #endif /* def FD_SETSIZE */
 128         extern int forked;
 129         int pid;
 130         int fd_setsize = _rpc_dtablesize();
 131
 132         /* Establish the identity of the parent ypupdated process. */
 133         pid = getpid();
 134
 135         for (;;) {
 136 #ifdef FD_SETSIZE
 137                 readfds = svc_fdset;
 138 #else
 139                 readfds = svc_fds;
 140 #endif /* def FD_SETSIZE */
 141                 switch (select(fd_setsize, &readfds, NULL, NULL,
 142                                (struct timeval *)0)) {
 143                 case -1:
 144                         if (errno == EINTR) {
 145                                 continue;
 146                         }
 147                         warn("svc_run: - select failed");
 148                         return;
 149                 case 0:
 150                         continue;
 151                 default:
 152                         svc_getreqset(&readfds);
 153                         if (forked && pid != getpid())
 154                                 exit(0);
 155                 }
 156         }
 157 }
 158
 159 static void
 160 reaper(int sig)
 161 {
 162         int status;
 163
 164         if (sig == SIGHUP) {
 165 #ifdef foo
 166                 load_securenets();
 167 #endif
 168                 return;
 169         }
 170
 171         if (sig == SIGCHLD) {
 172                 while (wait3(&status, WNOHANG, NULL) > 0)
 173                         children--;
 174         } else {
 175                 pmap_unset(YPU_PROG, YPU_VERS);
 176                 exit(0);
 177         }
 178 }
 179
 180 void
 181 usage(void)
 182 {
 183         fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
 184         exit(0);
 185 }
 186
 187 int
 188 main(int argc, char *argv[])
 189 {
 190         SVCXPRT *transp = NULL;
 191         int sock;
 192         int proto = 0;
 193         struct sockaddr_in saddr;
 194         int asize = sizeof (saddr);
 195         int ch;
 196
 197         while ((ch = getopt(argc, argv, "p:h")) != -1) {
 198                 switch (ch) {
 199                 case 'p':
 200                         yp_dir = optarg;
 201                         break;
 202                 default:
 203                         usage();
 204                         break;
 205                 }
 206         }
 207 #ifdef foo
 208         load_securenets();
 209 #endif
 210
 211         if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
 212                 yp_error("failed to register AUTH_DES flavor");
 213                 exit(1);
 214         }
 215
 216         if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
 217                 int ssize = sizeof (int);
 218
 219                 if (saddr.sin_family != AF_INET)
 220                         exit(1);
 221                 if (getsockopt(0, SOL_SOCKET, SO_TYPE,
 222                                 (char *)&_rpcfdtype, &ssize) == -1)
 223                         exit(1);
 224                 sock = 0;
 225                 _rpcpmstart = 1;
 226                 proto = 0;
 227                 openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
 228         } else {
 229 #ifndef RPC_SVC_FG
 230                 if (daemon(0,0)) {
 231                         err(1, "cannot fork");
 232                 }
 233                 openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
 234 #endif
 235                 sock = RPC_ANYSOCK;
 236                 pmap_unset(YPU_PROG, YPU_VERS);
 237         }
 238
 239         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
 240                 transp = svcudp_create(sock);
 241                 if (transp == NULL) {
 242                         _msgout("cannot create udp service.");
 243                         exit(1);
 244                 }
 245                 if (!_rpcpmstart)
 246                         proto = IPPROTO_UDP;
 247                 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
 248                         _msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
 249                         exit(1);
 250                 }
 251         }
 252
 253         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
 254                 transp = svctcp_create(sock, 0, 0);
 255                 if (transp == NULL) {
 256                         _msgout("cannot create tcp service.");
 257                         exit(1);
 258                 }
 259                 if (!_rpcpmstart)
 260                         proto = IPPROTO_TCP;
 261                 if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
 262                         _msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
 263                         exit(1);
 264                 }
 265         }
 266
 267         if (transp == (SVCXPRT *)NULL) {
 268                 _msgout("could not create a handle");
 269                 exit(1);
 270         }
 271         if (_rpcpmstart) {
 272                 signal(SIGALRM, (SIG_PF) closedown);
 273                 alarm(_RPCSVC_CLOSEDOWN/2);
 274         }
 275
 276         signal(SIGPIPE, SIG_IGN);
 277         signal(SIGCHLD, (SIG_PF) reaper);
 278         signal(SIGTERM, (SIG_PF) reaper);
 279         signal(SIGINT, (SIG_PF) reaper);
 280         signal(SIGHUP, (SIG_PF) reaper);
 281
 282         ypupdated_svc_run();
 283         _msgout("svc_run returned");
 284         exit(1);
 285         /* NOTREACHED */
 286 }