580 lines
13 KiB
C
580 lines
13 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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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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/*
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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 <sys/types.h>
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#include <sys/mman.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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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 <stdarg.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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#ifdef __cplusplus
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#include <sysent.h> /* getdtablesize, open */
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#endif /* __cplusplus */
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#include <netinet/in.h>
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#include <netdb.h>
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#include "yp_extern.h"
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#include <netconfig.h>
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#include <rpc/rpc.h>
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#include <rpc/rpc_com.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; /* Whether Stream or Datagram? */
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static int _rpcaf;
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static int _rpcfd;
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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 *, SVCXPRT *);
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extern void ypprog_2(struct svc_req *, 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;
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int do_dns = 0;
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int resfd;
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struct socklistent {
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int sle_sock;
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struct sockaddr_storage sle_ss;
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SLIST_ENTRY(socklistent) sle_next;
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};
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static SLIST_HEAD(, socklistent) sle_head =
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SLIST_HEAD_INITIALIZER(sle_head);
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struct bindaddrlistent {
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const char *ble_hostname;
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SLIST_ENTRY(bindaddrlistent) ble_next;
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};
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static SLIST_HEAD(, bindaddrlistent) ble_head =
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SLIST_HEAD_INITIALIZER(ble_head);
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static char *servname = "0";
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static
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void _msgout(char* msg, ...)
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{
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va_list ap;
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va_start(ap, msg);
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if (debug) {
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if (_rpcpmstart)
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vsyslog(LOG_ERR, msg, ap);
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else
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vwarnx(msg, ap);
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} else
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vsyslog(LOG_ERR, msg, ap);
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va_end(ap);
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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)svc_unreg(YPPROG, YPVERS);
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(void)svc_unreg(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 addr] [-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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static int
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create_service(const int sock, const struct netconfig *nconf,
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const struct __rpc_sockinfo *si)
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{
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int error;
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SVCXPRT *transp;
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struct addrinfo hints, *res, *res0;
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struct socklistent *slep;
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struct bindaddrlistent *blep;
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struct netbuf svcaddr;
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SLIST_INIT(&sle_head);
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memset(&hints, 0, sizeof(hints));
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memset(&svcaddr, 0, sizeof(svcaddr));
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hints.ai_family = si->si_af;
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hints.ai_socktype = si->si_socktype;
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hints.ai_protocol = si->si_proto;
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/*
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* Build socketlist from bindaddrlist.
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*/
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if (sock == RPC_ANYFD) {
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SLIST_FOREACH(blep, &ble_head, ble_next) {
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if (blep->ble_hostname == NULL)
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hints.ai_flags = AI_PASSIVE;
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else
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hints.ai_flags = 0;
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error = getaddrinfo(blep->ble_hostname, servname,
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&hints, &res0);
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if (error) {
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_msgout("getaddrinfo(): %s",
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gai_strerror(error));
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return -1;
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}
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for (res = res0; res; res = res->ai_next) {
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int s;
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s = __rpc_nconf2fd(nconf);
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if (s < 0) {
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if (errno == EAFNOSUPPORT)
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_msgout("unsupported"
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" transport: %s",
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nconf->nc_netid);
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else
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_msgout("cannot create"
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" %s socket: %s",
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nconf->nc_netid,
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strerror(errno));
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freeaddrinfo(res0);
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return -1;
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}
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if (bindresvport_sa(s, res->ai_addr) == -1) {
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if ((errno != EPERM) ||
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(bind(s, res->ai_addr,
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res->ai_addrlen) == -1)) {
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_msgout("cannot bind "
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"%s socket: %s",
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nconf->nc_netid,
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strerror(errno));
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freeaddrinfo(res0);
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close(sock);
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return -1;
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}
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}
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if (nconf->nc_semantics != NC_TPI_CLTS)
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listen(s, SOMAXCONN);
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slep = malloc(sizeof(*slep));
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if (slep == NULL) {
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_msgout("malloc failed: %s",
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strerror(errno));
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freeaddrinfo(res0);
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close(s);
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return -1;
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}
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memset(slep, 0, sizeof(*slep));
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memcpy(&slep->sle_ss, res->ai_addr,
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res->ai_addrlen);
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slep->sle_sock = s;
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SLIST_INSERT_HEAD(&sle_head, slep, sle_next);
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/*
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* If servname == "0", redefine it by using
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* the bound socket.
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*/
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if (strncmp("0", servname, 1) == 0) {
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struct sockaddr *sap;
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socklen_t slen;
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char *sname;
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sname = malloc(NI_MAXSERV);
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if (sname == NULL) {
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_msgout("malloc(): %s",
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strerror(errno));
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freeaddrinfo(res0);
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close(s);
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return -1;
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}
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memset(sname, 0, NI_MAXSERV);
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sap = (struct sockaddr *)&slep->sle_ss;
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slen = sizeof(*sap);
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error = getsockname(s, sap, &slen);
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if (error) {
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_msgout("getsockname(): %s",
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strerror(errno));
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freeaddrinfo(res0);
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close(s);
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free(sname);
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return -1;
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}
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error = getnameinfo(sap, slen,
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NULL, 0,
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sname, NI_MAXSERV,
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (error) {
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_msgout("getnameinfo(): %s",
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strerror(errno));
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freeaddrinfo(res0);
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close(s);
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free(sname);
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return -1;
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}
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servname = sname;
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}
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}
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freeaddrinfo(res0);
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}
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} else {
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slep = malloc(sizeof(*slep));
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if (slep == NULL) {
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_msgout("malloc failed: %s", strerror(errno));
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return -1;
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}
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memset(slep, 0, sizeof(*slep));
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slep->sle_sock = sock;
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SLIST_INSERT_HEAD(&sle_head, slep, sle_next);
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}
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/*
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* Traverse socketlist and create rpc service handles for each socket.
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*/
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SLIST_FOREACH(slep, &sle_head, sle_next) {
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if (nconf->nc_semantics == NC_TPI_CLTS)
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transp = svc_dg_create(slep->sle_sock, 0, 0);
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else
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transp = svc_vc_create(slep->sle_sock, RPC_MAXDATASIZE,
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RPC_MAXDATASIZE);
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if (transp == NULL) {
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_msgout("unable to create service: %s",
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nconf->nc_netid);
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continue;
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}
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if (!svc_reg(transp, YPPROG, YPOLDVERS, ypprog_1, NULL)) {
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svc_destroy(transp);
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close(slep->sle_sock);
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_msgout("unable to register (YPPROG, YPOLDVERS, %s):"
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" %s", nconf->nc_netid, strerror(errno));
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continue;
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}
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if (!svc_reg(transp, YPPROG, YPVERS, ypprog_2, NULL)) {
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svc_destroy(transp);
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close(slep->sle_sock);
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_msgout("unable to register (YPPROG, YPVERS, %s): %s",
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nconf->nc_netid, strerror(errno));
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continue;
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}
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}
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while(!(SLIST_EMPTY(&sle_head)))
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SLIST_REMOVE_HEAD(&sle_head, sle_next);
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/*
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* Register RPC service to rpcbind by using AI_PASSIVE address.
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*/
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hints.ai_flags = AI_PASSIVE;
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error = getaddrinfo(NULL, servname, &hints, &res0);
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if (error) {
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_msgout("getaddrinfo(): %s", gai_strerror(error));
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return -1;
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}
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svcaddr.buf = res0->ai_addr;
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svcaddr.len = res0->ai_addrlen;
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if (si->si_af == AF_INET) {
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/* XXX: ignore error intentionally */
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rpcb_set(YPPROG, YPOLDVERS, nconf, &svcaddr);
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}
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/* XXX: ignore error intentionally */
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rpcb_set(YPPROG, YPVERS, nconf, &svcaddr);
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freeaddrinfo(res0);
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return 0;
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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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int ch;
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int error;
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int ntrans;
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void *nc_handle;
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struct netconfig *nconf;
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struct __rpc_sockinfo si;
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struct bindaddrlistent *blep;
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memset(&si, 0, sizeof(si));
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SLIST_INIT(&ble_head);
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while ((ch = getopt(argc, argv, "dh:np: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 'h':
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blep = malloc(sizeof(*blep));
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if (blep == NULL)
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err(1, "malloc() failed: -h %s", optarg);
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blep->ble_hostname = optarg;
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SLIST_INSERT_HEAD(&ble_head, blep, ble_next);
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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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servname = optarg;
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break;
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default:
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usage();
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}
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}
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/*
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* Add "anyaddr" entry if no -h is specified.
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*/
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if (SLIST_EMPTY(&ble_head)) {
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blep = malloc(sizeof(*blep));
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if (blep == NULL)
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err(1, "malloc() failed");
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memset(blep, 0, sizeof(*blep));
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SLIST_INSERT_HEAD(&ble_head, blep, ble_next);
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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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nc_handle = setnetconfig();
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if (nc_handle == NULL)
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err(1, "cannot read %s", NETCONFIG);
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if (__rpc_fd2sockinfo(0, &si) != 0) {
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/* invoked from inetd */
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_rpcpmstart = 1;
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_rpcfdtype = si.si_socktype;
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_rpcaf = si.si_af;
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_rpcfd = 0;
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openlog("ypserv", LOG_PID, LOG_DAEMON);
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} else {
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/* standalone mode */
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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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_rpcpmstart = 0;
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_rpcaf = AF_INET;
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_rpcfd = RPC_ANYFD;
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unregister();
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}
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if (madvise(NULL, 0, MADV_PROTECT) != 0)
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_msgout("madvise(): %s", strerror(errno));
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/*
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* Create RPC service for each transport.
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*/
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ntrans = 0;
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while((nconf = getnetconfig(nc_handle))) {
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if ((nconf->nc_flag & NC_VISIBLE)) {
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if (__rpc_nconf2sockinfo(nconf, &si) == 0) {
|
|
_msgout("cannot get information for %s. "
|
|
"Ignored.", nconf->nc_netid);
|
|
continue;
|
|
}
|
|
if (_rpcpmstart) {
|
|
if (si.si_socktype != _rpcfdtype ||
|
|
si.si_af != _rpcaf)
|
|
continue;
|
|
} else if (si.si_af != _rpcaf)
|
|
continue;
|
|
error = create_service(_rpcfd, nconf, &si);
|
|
if (error) {
|
|
endnetconfig(nc_handle);
|
|
exit(1);
|
|
}
|
|
ntrans++;
|
|
}
|
|
}
|
|
endnetconfig(nc_handle);
|
|
while(!(SLIST_EMPTY(&ble_head)))
|
|
SLIST_REMOVE_HEAD(&ble_head, ble_next);
|
|
if (ntrans == 0) {
|
|
_msgout("no transport is available. Aborted.");
|
|
exit(1);
|
|
}
|
|
if (_rpcpmstart) {
|
|
(void) signal(SIGALRM, (SIG_PF) closedown);
|
|
(void) alarm(_RPCSVC_CLOSEDOWN/2);
|
|
}
|
|
/*
|
|
* Make sure SIGPIPE doesn't blow us away while servicing TCP
|
|
* connections.
|
|
*/
|
|
(void) signal(SIGPIPE, SIG_IGN);
|
|
(void) signal(SIGCHLD, (SIG_PF) reaper);
|
|
(void) signal(SIGTERM, (SIG_PF) reaper);
|
|
(void) signal(SIGINT, (SIG_PF) reaper);
|
|
(void) signal(SIGHUP, (SIG_PF) reaper);
|
|
yp_svc_run();
|
|
_msgout("svc_run returned");
|
|
exit(1);
|
|
/* NOTREACHED */
|
|
}
|