usr.sbin/rpc.ypxfrd/ypxfrd_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.ypxfrd/ypxfrd_main.c,v 1.8.2.3 2002/02/15 00:46:58 des Exp $
  33  * $DragonFly: src/usr.sbin/rpc.ypxfrd/ypxfrd_main.c,v 1.5 2005/11/25 00:32:49 swildner Exp $
  34  */
  35
  36 #include "ypxfrd.h"
  37 #include <err.h>
  38 #include <fcntl.h>
  39 #include <paths.h>
  40 #include <stdio.h>
  41 #include <stdlib.h> /* getenv, exit */
  42 #include <unistd.h>
  43 #include <rpc/pmap_clnt.h> /* for pmap_unset */
  44 #include <string.h> /* strcmp */
  45 #include <signal.h>
  46 #include <sys/ttycom.h> /* TIOCNOTTY */
  47 #ifdef __cplusplus
  48 #include <sysent.h> /* getdtablesize, open */
  49 #endif /* __cplusplus */
  50 #include <memory.h>
  51 #include <sys/socket.h>
  52 #include <netinet/in.h>
  53 #include <syslog.h>
  54 #include "ypxfrd_extern.h"
  55 #include <sys/wait.h>
  56 #include <errno.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.ypxfrd";
  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
 121 static void
 122 ypxfrd_svc_run(void)
 123 {
 124 #ifdef FD_SETSIZE
 125         fd_set readfds;
 126 #else
 127         int readfds;
 128 #endif /* def FD_SETSIZE */
 129         extern int forked;
 130         int pid;
 131         int fd_setsize = _rpc_dtablesize();
 132
 133         /* Establish the identity of the parent ypserv process. */
 134         pid = getpid();
 135
 136         for (;;) {
 137 #ifdef FD_SETSIZE
 138                 readfds = svc_fdset;
 139 #else
 140                 readfds = svc_fds;
 141 #endif /* def FD_SETSIZE */
 142                 switch (select(fd_setsize, &readfds, NULL, NULL, NULL)) {
 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         int                     saved_errno;
 164
 165         saved_errno = errno;
 166
 167         if (sig == SIGHUP) {
 168                 load_securenets();
 169                 errno = saved_errno;
 170                 return;
 171         }
 172
 173         if (sig == SIGCHLD) {
 174                 while (wait3(&status, WNOHANG, NULL) > 0)
 175                         children--;
 176         } else {
 177                 pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
 178                 exit(0);
 179         }
 180
 181         errno = saved_errno;
 182         return;
 183 }
 184
 185 void
 186 usage(void)
 187 {
 188         fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
 189         exit(0);
 190 }
 191
 192 int
 193 main(int argc, char *argv[])
 194 {
 195         SVCXPRT *transp = NULL;
 196         int sock;
 197         int proto = 0;
 198         struct sockaddr_in saddr;
 199         int asize = sizeof (saddr);
 200         int ch;
 201
 202         while ((ch = getopt(argc, argv, "p:h")) != -1) {
 203                 switch (ch) {
 204                 case 'p':
 205                         yp_dir = optarg;
 206                         break;
 207                 default:
 208                         usage();
 209                         break;
 210                 }
 211         }
 212
 213         load_securenets();
 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.ypxfrd", LOG_PID, LOG_DAEMON);
 227         } else {
 228 #ifndef RPC_SVC_FG
 229                 int size;
 230                 int pid, i;
 231
 232                 pid = fork();
 233                 if (pid < 0)
 234                         err(1, "fork");
 235                 if (pid)
 236                         exit(0);
 237                 size = getdtablesize();
 238                 for (i = 0; i < size; i++)
 239                         close(i);
 240                 i = open(_PATH_CONSOLE, 2);
 241                 dup2(i, 1);
 242                 dup2(i, 2);
 243                 i = open(_PATH_TTY, 2);
 244                 if (i >= 0) {
 245                         ioctl(i, TIOCNOTTY, NULL);
 246                         close(i);
 247                 }
 248                 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
 249 #endif
 250                 sock = RPC_ANYSOCK;
 251                 pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
 252         }
 253
 254         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
 255                 transp = svcudp_create(sock);
 256                 if (transp == NULL) {
 257                         _msgout("cannot create udp service.");
 258                         exit(1);
 259                 }
 260                 if (!_rpcpmstart)
 261                         proto = IPPROTO_UDP;
 262                 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
 263                         _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
 264                         exit(1);
 265                 }
 266         }
 267
 268         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
 269                 transp = svctcp_create(sock, 0, 0);
 270                 if (transp == NULL) {
 271                         _msgout("cannot create tcp service.");
 272                         exit(1);
 273                 }
 274                 if (!_rpcpmstart)
 275                         proto = IPPROTO_TCP;
 276                 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
 277                         _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
 278                         exit(1);
 279                 }
 280         }
 281
 282         if (transp == NULL) {
 283                 _msgout("could not create a handle");
 284                 exit(1);
 285         }
 286         if (_rpcpmstart) {
 287                 signal(SIGALRM, (SIG_PF) closedown);
 288                 alarm(_RPCSVC_CLOSEDOWN/2);
 289         }
 290
 291         signal(SIGPIPE, SIG_IGN);
 292         signal(SIGCHLD, (SIG_PF) reaper);
 293         signal(SIGTERM, (SIG_PF) reaper);
 294         signal(SIGINT, (SIG_PF) reaper);
 295         signal(SIGHUP, (SIG_PF) reaper);
 296
 297         ypxfrd_svc_run();
 298         _msgout("svc_run returned");
 299         exit(1);
 300         /* NOTREACHED */
 301 }