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
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  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 <rpc/rpc_com.h>
  45 #include <string.h> /* strcmp */
  46 #include <signal.h>
  47 #include <sys/ttycom.h> /* TIOCNOTTY */
  48 #ifdef __cplusplus
  49 #include <sysent.h> /* getdtablesize, open */
  50 #endif /* __cplusplus */
  51 #include <memory.h>
  52 #include <sys/socket.h>
  53 #include <netinet/in.h>
  54 #include <syslog.h>
  55 #include "ypxfrd_extern.h"
  56 #include <sys/wait.h>
  57 #include <errno.h>
  58
  59 #ifndef SIG_PF
  60 #define SIG_PF void(*)(int)
  61 #endif
  62
  63 #ifdef DEBUG
  64 #define RPC_SVC_FG
  65 #endif
  66
  67 #define _RPCSVC_CLOSEDOWN 120
  68 int _rpcpmstart;                /* Started by a port monitor ? */
  69 static int _rpcfdtype;
  70                  /* Whether Stream or Datagram ? */
  71         /* States a server can be in wrt request */
  72
  73 #define _IDLE 0
  74 #define _SERVED 1
  75 #define _SERVING 2
  76
  77 extern int _rpcsvcstate;         /* Set when a request is serviced */
  78
  79 char *progname = "rpc.ypxfrd";
  80 char *yp_dir = "/var/yp/";
  81
  82 static void
  83 _msgout(char *msg)
  84 {
  85 #ifdef RPC_SVC_FG
  86         if (_rpcpmstart)
  87                 syslog(LOG_ERR, "%s", msg);
  88         else
  89                 warnx("%s", msg);
  90 #else
  91         syslog(LOG_ERR, "%s", msg);
  92 #endif
  93 }
  94
  95 static void
  96 closedown(int sig)
  97 {
  98         if (_rpcsvcstate == _IDLE) {
  99                 extern fd_set svc_fdset;
 100                 static int size;
 101                 int i, openfd;
 102
 103                 if (_rpcfdtype == SOCK_DGRAM)
 104                         exit(0);
 105                 if (size == 0) {
 106                         size = getdtablesize();
 107                 }
 108                 for (i = 0, openfd = 0; i < size && openfd < 2; i++)
 109                         if (FD_ISSET(i, &svc_fdset))
 110                                 openfd++;
 111                 if (openfd <= 1)
 112                         exit(0);
 113         }
 114         if (_rpcsvcstate == _SERVED)
 115                 _rpcsvcstate = _IDLE;
 116
 117         (void) signal(SIGALRM, (SIG_PF) closedown);
 118         (void) alarm(_RPCSVC_CLOSEDOWN/2);
 119 }
 120
 121
 122 static void
 123 ypxfrd_svc_run(void)
 124 {
 125 #ifdef FD_SETSIZE
 126         fd_set readfds;
 127 #else
 128         int readfds;
 129 #endif /* def FD_SETSIZE */
 130         extern int forked;
 131         int pid;
 132         int fd_setsize = _rpc_dtablesize();
 133
 134         /* Establish the identity of the parent ypserv process. */
 135         pid = getpid();
 136
 137         for (;;) {
 138 #ifdef FD_SETSIZE
 139                 readfds = svc_fdset;
 140 #else
 141                 readfds = svc_fds;
 142 #endif /* def FD_SETSIZE */
 143                 switch (select(fd_setsize, &readfds, NULL, NULL,
 144                                (struct timeval *)0)) {
 145                 case -1:
 146                         if (errno == EINTR) {
 147                                 continue;
 148                         }
 149                         warn("svc_run: - select failed");
 150                         return;
 151                 case 0:
 152                         continue;
 153                 default:
 154                         svc_getreqset(&readfds);
 155                         if (forked && pid != getpid())
 156                                 exit(0);
 157                 }
 158         }
 159 }
 160
 161 static void reaper(int sig)
 162 {
 163         int                     status;
 164         int                     saved_errno;
 165
 166         saved_errno = errno;
 167
 168         if (sig == SIGHUP) {
 169                 load_securenets();
 170                 errno = saved_errno;
 171                 return;
 172         }
 173
 174         if (sig == SIGCHLD) {
 175                 while (wait3(&status, WNOHANG, NULL) > 0)
 176                         children--;
 177         } else {
 178                 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
 179                 exit(0);
 180         }
 181
 182         errno = saved_errno;
 183         return;
 184 }
 185
 186 void
 187 usage(void)
 188 {
 189         fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
 190         exit(0);
 191 }
 192
 193 int
 194 main(int argc, char *argv[])
 195 {
 196         register SVCXPRT *transp = NULL;
 197         int sock;
 198         int proto = 0;
 199         struct sockaddr_in saddr;
 200         int asize = sizeof (saddr);
 201         int ch;
 202
 203         while ((ch = getopt(argc, argv, "p:h")) != -1) {
 204                 switch (ch) {
 205                 case 'p':
 206                         yp_dir = optarg;
 207                         break;
 208                 default:
 209                         usage();
 210                         break;
 211                 }
 212         }
 213
 214         load_securenets();
 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.ypxfrd", LOG_PID, LOG_DAEMON);
 228         } else {
 229 #ifndef RPC_SVC_FG
 230                 int size;
 231                 int pid, i;
 232
 233                 pid = fork();
 234                 if (pid < 0)
 235                         err(1, "fork");
 236                 if (pid)
 237                         exit(0);
 238                 size = getdtablesize();
 239                 for (i = 0; i < size; i++)
 240                         (void) close(i);
 241                 i = open(_PATH_CONSOLE, 2);
 242                 (void) dup2(i, 1);
 243                 (void) dup2(i, 2);
 244                 i = open(_PATH_TTY, 2);
 245                 if (i >= 0) {
 246                         (void) ioctl(i, TIOCNOTTY, (char *)NULL);
 247                         (void) close(i);
 248                 }
 249                 openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
 250 #endif
 251                 sock = RPC_ANYSOCK;
 252                 (void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
 253         }
 254
 255         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
 256                 transp = svcudp_create(sock);
 257                 if (transp == NULL) {
 258                         _msgout("cannot create udp service.");
 259                         exit(1);
 260                 }
 261                 if (!_rpcpmstart)
 262                         proto = IPPROTO_UDP;
 263                 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
 264                         _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
 265                         exit(1);
 266                 }
 267         }
 268
 269         if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
 270                 transp = svctcp_create(sock, 0, 0);
 271                 if (transp == NULL) {
 272                         _msgout("cannot create tcp service.");
 273                         exit(1);
 274                 }
 275                 if (!_rpcpmstart)
 276                         proto = IPPROTO_TCP;
 277                 if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
 278                         _msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
 279                         exit(1);
 280                 }
 281         }
 282
 283         if (transp == (SVCXPRT *)NULL) {
 284                 _msgout("could not create a handle");
 285                 exit(1);
 286         }
 287         if (_rpcpmstart) {
 288                 (void) signal(SIGALRM, (SIG_PF) closedown);
 289                 (void) alarm(_RPCSVC_CLOSEDOWN/2);
 290         }
 291
 292         (void) signal(SIGPIPE, SIG_IGN);
 293         (void) signal(SIGCHLD, (SIG_PF) reaper);
 294         (void) signal(SIGTERM, (SIG_PF) reaper);
 295         (void) signal(SIGINT, (SIG_PF) reaper);
 296         (void) signal(SIGHUP, (SIG_PF) reaper);
 297
 298         ypxfrd_svc_run();
 299         _msgout("svc_run returned");
 300         exit(1);
 301         /* NOTREACHED */
 302 }