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3868f70efe
PR: bin/109494 Submitted by: mtm MFC after: 1 week
392 lines
9.0 KiB
C
392 lines
9.0 KiB
C
/*
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* Copyright (c) 1995
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* Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Bill Paul.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* ypserv startup function.
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* We need out own main() since we have to do some additional work
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* that rpcgen won't do for us. Most of this file was generated using
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* rpcgen.new, and later modified.
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*/
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#include "yp.h"
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#include <err.h>
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#include <errno.h>
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#include <memory.h>
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#include <stdio.h>
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#include <signal.h>
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#include <stdlib.h> /* getenv, exit */
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#include <string.h> /* strcmp */
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#include <syslog.h>
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#include <unistd.h>
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#include <rpc/pmap_clnt.h> /* for pmap_unset */
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#ifdef __cplusplus
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#include <sysent.h> /* getdtablesize, open */
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#endif /* __cplusplus */
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/wait.h>
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#include "yp_extern.h"
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#include <rpc/rpc.h>
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#ifndef SIG_PF
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#define SIG_PF void(*)(int)
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#endif
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#define _RPCSVC_CLOSEDOWN 120
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int _rpcpmstart; /* Started by a port monitor ? */
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static int _rpcfdtype;
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/* Whether Stream or Datagram ? */
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/* States a server can be in wrt request */
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#define _IDLE 0
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#define _SERVED 1
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#define _SERVING 2
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extern void ypprog_1(struct svc_req *, register SVCXPRT *);
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extern void ypprog_2(struct svc_req *, register SVCXPRT *);
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extern int _rpc_dtablesize(void);
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extern int _rpcsvcstate; /* Set when a request is serviced */
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char *progname = "ypserv";
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char *yp_dir = _PATH_YP;
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/*int debug = 0;*/
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int do_dns = 0;
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int resfd;
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struct socktype {
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const char *st_name;
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int st_type;
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};
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static struct socktype stlist[] = {
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{ "tcp", SOCK_STREAM },
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{ "udp", SOCK_DGRAM },
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{ NULL, 0 }
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};
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static
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void _msgout(char* msg)
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{
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if (debug) {
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if (_rpcpmstart)
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syslog(LOG_ERR, "%s", msg);
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else
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warnx("%s", msg);
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} else
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syslog(LOG_ERR, "%s", msg);
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}
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pid_t yp_pid;
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static void
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yp_svc_run(void)
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{
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#ifdef FD_SETSIZE
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fd_set readfds;
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#else
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int readfds;
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#endif /* def FD_SETSIZE */
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int fd_setsize = _rpc_dtablesize();
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struct timeval timeout;
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/* Establish the identity of the parent ypserv process. */
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yp_pid = getpid();
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for (;;) {
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#ifdef FD_SETSIZE
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readfds = svc_fdset;
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#else
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readfds = svc_fds;
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#endif /* def FD_SETSIZE */
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FD_SET(resfd, &readfds);
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timeout.tv_sec = RESOLVER_TIMEOUT;
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timeout.tv_usec = 0;
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switch (select(fd_setsize, &readfds, NULL, NULL,
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&timeout)) {
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case -1:
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if (errno == EINTR) {
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continue;
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}
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warn("svc_run: - select failed");
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return;
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case 0:
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if (getpid() == yp_pid)
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yp_prune_dnsq();
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break;
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default:
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if (getpid() == yp_pid) {
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if (FD_ISSET(resfd, &readfds)) {
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yp_run_dnsq();
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FD_CLR(resfd, &readfds);
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}
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svc_getreqset(&readfds);
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}
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}
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if (yp_pid != getpid())
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_exit(0);
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}
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}
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static void
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unregister(void)
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{
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(void) pmap_unset(YPPROG, YPVERS);
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(void) pmap_unset(YPPROG, YPOLDVERS);
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}
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static void
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reaper(int sig)
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{
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int status;
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int saved_errno;
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saved_errno = errno;
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if (sig == SIGHUP) {
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load_securenets();
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#ifdef DB_CACHE
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yp_flush_all();
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#endif
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errno = saved_errno;
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return;
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}
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if (sig == SIGCHLD) {
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while (wait3(&status, WNOHANG, NULL) > 0)
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children--;
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} else {
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unregister();
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exit(0);
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}
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errno = saved_errno;
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return;
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: ypserv [-h] [-d] [-n] [-p path] [-P port]\n");
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exit(1);
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}
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static void
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closedown(int sig)
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{
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if (_rpcsvcstate == _IDLE) {
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extern fd_set svc_fdset;
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static int size;
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int i, openfd;
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if (_rpcfdtype == SOCK_DGRAM) {
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unregister();
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exit(0);
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}
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if (size == 0) {
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size = getdtablesize();
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}
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for (i = 0, openfd = 0; i < size && openfd < 2; i++)
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if (FD_ISSET(i, &svc_fdset))
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openfd++;
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if (openfd <= 1) {
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unregister();
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exit(0);
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}
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}
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if (_rpcsvcstate == _SERVED)
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_rpcsvcstate = _IDLE;
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(void) signal(SIGALRM, (SIG_PF) closedown);
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(void) alarm(_RPCSVC_CLOSEDOWN/2);
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}
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int
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main(int argc, char *argv[])
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{
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register SVCXPRT *transp = NULL;
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int sock;
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int proto = 0;
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struct sockaddr_in saddr;
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socklen_t asize = sizeof (saddr);
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int ch;
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in_port_t yp_port = 0;
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char *errstr;
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struct socktype *st;
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while ((ch = getopt(argc, argv, "hdnp:P:")) != -1) {
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switch (ch) {
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case 'd':
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debug = ypdb_debug = 1;
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break;
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case 'n':
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do_dns = 1;
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break;
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case 'p':
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yp_dir = optarg;
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break;
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case 'P':
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yp_port = (in_port_t)strtonum(optarg, 1, 65535,
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(const char **)&errstr);
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if (yp_port == 0 && errstr != NULL) {
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_msgout("invalid port number provided");
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exit(1);
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}
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break;
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case 'h':
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default:
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usage();
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}
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}
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load_securenets();
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yp_init_resolver();
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#ifdef DB_CACHE
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yp_init_dbs();
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#endif
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if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
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int ssize = sizeof (int);
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if (saddr.sin_family != AF_INET)
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exit(1);
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if (getsockopt(0, SOL_SOCKET, SO_TYPE,
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(char *)&_rpcfdtype, &ssize) == -1)
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exit(1);
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sock = 0;
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_rpcpmstart = 1;
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proto = 0;
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openlog("ypserv", LOG_PID, LOG_DAEMON);
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} else {
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if (!debug) {
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if (daemon(0,0)) {
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err(1,"cannot fork");
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}
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openlog("ypserv", LOG_PID, LOG_DAEMON);
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}
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sock = RPC_ANYSOCK;
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(void) pmap_unset(YPPROG, YPVERS);
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(void) pmap_unset(YPPROG, 1);
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}
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/*
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* Initialize TCP/UDP sockets.
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*/
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memset((char *)&saddr, 0, sizeof(saddr));
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saddr.sin_family = AF_INET;
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saddr.sin_addr.s_addr = htonl(INADDR_ANY);
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saddr.sin_port = htons(yp_port);
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for (st = stlist; st->st_name != NULL; st++) {
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/* Do not bind the socket if the user didn't specify a port */
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if (yp_port == 0)
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break;
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sock = socket(AF_INET, st->st_type, 0);
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if (sock == -1) {
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if ((asprintf(&errstr, "cannot create a %s socket",
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st->st_name)) == -1)
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err(1, "unexpected failure in asprintf()");
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_msgout(errstr);
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free((void *)errstr);
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exit(1);
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}
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if (bind(sock, (struct sockaddr *) &saddr, sizeof(saddr))
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== -1) {
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if ((asprintf(&errstr, "cannot bind %s socket",
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st->st_name)) == -1)
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err(1, "unexpected failure in asprintf()");
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_msgout(errstr);
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free((void *)errstr);
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exit(1);
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}
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errstr = NULL;
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}
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if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
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transp = svcudp_create(sock);
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if (transp == NULL) {
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_msgout("cannot create udp service");
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exit(1);
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}
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if (!_rpcpmstart)
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proto = IPPROTO_UDP;
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if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
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_msgout("unable to register (YPPROG, YPOLDVERS, udp)");
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exit(1);
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}
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if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
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_msgout("unable to register (YPPROG, YPVERS, udp)");
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exit(1);
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}
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}
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if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
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transp = svctcp_create(sock, 0, 0);
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if (transp == NULL) {
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_msgout("cannot create tcp service");
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exit(1);
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}
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if (!_rpcpmstart)
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proto = IPPROTO_TCP;
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if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
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_msgout("unable to register (YPPROG, YPOLDVERS, tcp)");
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exit(1);
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}
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if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
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_msgout("unable to register (YPPROG, YPVERS, tcp)");
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exit(1);
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}
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}
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if (transp == (SVCXPRT *)NULL) {
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_msgout("could not create a handle");
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exit(1);
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}
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if (_rpcpmstart) {
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(void) signal(SIGALRM, (SIG_PF) closedown);
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(void) alarm(_RPCSVC_CLOSEDOWN/2);
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}
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/*
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* Make sure SIGPIPE doesn't blow us away while servicing TCP
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* connections.
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*/
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(void) signal(SIGPIPE, SIG_IGN);
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(void) signal(SIGCHLD, (SIG_PF) reaper);
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(void) signal(SIGTERM, (SIG_PF) reaper);
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(void) signal(SIGINT, (SIG_PF) reaper);
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(void) signal(SIGHUP, (SIG_PF) reaper);
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yp_svc_run();
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_msgout("svc_run returned");
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exit(1);
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/* NOTREACHED */
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}
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