237 lines
6.2 KiB
C
237 lines
6.2 KiB
C
/* db.c
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Persistent database management routines for DHCPD... */
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/*
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* Copyright (c) 1995, 1996 The Internet Software Consortium.
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* 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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*
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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. Neither the name of The Internet Software Consortium nor the names
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* of its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND
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* CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* 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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* This software has been written for the Internet Software Consortium
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* by Ted Lemon <mellon@fugue.com> in cooperation with Vixie
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* Enterprises. To learn more about the Internet Software Consortium,
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* see ``http://www.vix.com/isc''. To learn more about Vixie
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* Enterprises, see ``http://www.vix.com''.
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*/
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#ifndef lint
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static char copyright[] =
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"$Id: db.c,v 1.1.1.2 1997/06/03 02:49:55 mellon Exp $ Copyright (c) 1995, 1996 The Internet Software Consortium. All rights reserved.\n";
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#endif /* not lint */
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#include "dhcpd.h"
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FILE *db_file;
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static int counting = 0;
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static int count = 0;
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TIME write_time;
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/* Write the specified lease to the current lease database file. */
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int write_lease (lease)
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struct lease *lease;
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{
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struct tm *t;
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char tbuf [64];
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int errors = 0;
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if (counting)
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++count;
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errno = 0;
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fprintf (db_file, "lease %s {\n", piaddr (lease -> ip_addr));
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if (errno) {
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++errors;
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}
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t = gmtime (&lease -> starts);
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sprintf (tbuf, "%d %d/%d/%d %02d:%02d:%02d;",
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t -> tm_wday, t -> tm_year + 1900,
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t -> tm_mon + 1, t -> tm_mday,
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t -> tm_hour, t -> tm_min, t -> tm_sec);
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errno = 0;
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fprintf (db_file, "\tstarts %s\n", tbuf);
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if (errno) {
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++errors;
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}
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t = gmtime (&lease -> ends);
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sprintf (tbuf, "%d %d/%d/%d %02d:%02d:%02d;",
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t -> tm_wday, t -> tm_year + 1900,
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t -> tm_mon + 1, t -> tm_mday,
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t -> tm_hour, t -> tm_min, t -> tm_sec);
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errno = 0;
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fprintf (db_file, "\tends %s", tbuf);
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if (errno) {
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++errors;
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}
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if (lease -> hardware_addr.hlen) {
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errno = 0;
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fprintf (db_file, "\n\thardware %s %s;",
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hardware_types [lease -> hardware_addr.htype],
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print_hw_addr (lease -> hardware_addr.htype,
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lease -> hardware_addr.hlen,
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lease -> hardware_addr.haddr));
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if (errno) {
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++errors;
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}
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}
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if (lease -> uid_len) {
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int i;
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errno = 0;
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fprintf (db_file, "\n\tuid %x", lease -> uid [0]);
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if (errno) {
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++errors;
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}
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for (i = 1; i < lease -> uid_len; i++) {
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errno = 0;
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fprintf (db_file, ":%x", lease -> uid [i]);
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if (errno) {
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++errors;
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}
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}
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putc (';', db_file);
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}
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if (lease -> flags & BOOTP_LEASE) {
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errno = 0;
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fprintf (db_file, "\n\tdynamic-bootp;");
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if (errno) {
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++errors;
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}
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}
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if (lease -> flags & ABANDONED_LEASE) {
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errno = 0;
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fprintf (db_file, "\n\tabandoned;");
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if (errno) {
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++errors;
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}
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}
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if (lease -> client_hostname) {
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errno = 0;
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fprintf (db_file, "\n\tclient-hostname %s;",
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lease -> client_hostname);
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if (errno) {
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++errors;
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}
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}
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if (lease -> hostname) {
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errno = 0;
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fprintf (db_file, "\n\thostname %s;",
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lease -> client_hostname);
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if (errno) {
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++errors;
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}
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}
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errno = 0;
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fputs ("\n}\n", db_file);
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if (errno) {
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++errors;
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}
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if (errors)
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note ("write_lease: unable to write lease %s",
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piaddr (lease -> ip_addr));
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return !errors;
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}
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/* Commit any leases that have been written out... */
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int commit_leases ()
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{
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/* Commit any outstanding writes to the lease database file.
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We need to do this even if we're rewriting the file below,
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just in case the rewrite fails. */
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if (fflush (db_file) == EOF) {
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note ("commit_leases: unable to commit: %m");
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return 0;
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}
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if (fsync (fileno (db_file)) < 0) {
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note ("commit_leases: unable to commit: %m");
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return 0;
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}
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/* If we've written more than a thousand leases or if
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we haven't rewritten the lease database in over an
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hour, rewrite it now. */
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if (count > 1000 || (count && cur_time - write_time > 3600)) {
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count = 0;
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write_time = cur_time;
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new_lease_file ();
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}
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return 1;
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}
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void db_startup ()
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{
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/* Read in the existing lease file... */
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read_leases ();
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GET_TIME (&write_time);
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new_lease_file ();
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}
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void new_lease_file ()
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{
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char newfname [512];
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char backfname [512];
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TIME t;
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/* If we already have an open database, close it. */
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if (db_file) {
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fclose (db_file);
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}
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/* Make a temporary lease file... */
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GET_TIME (&t);
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sprintf (newfname, "%s.%d", path_dhcpd_db, (int)t);
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if ((db_file = fopen (newfname, "w")) == NULL) {
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error ("Can't start new lease file: %m");
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}
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/* Write out all the leases that we know of... */
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counting = 0;
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write_leases ();
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/* Get the old database out of the way... */
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sprintf (backfname, "%s~", path_dhcpd_db);
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if (unlink (backfname) < 0 && errno != ENOENT)
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error ("Can't remove old lease database backup %s: %m",
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backfname);
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if (link (path_dhcpd_db, backfname) < 0)
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error ("Can't backup lease database %s to %s: %m",
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path_dhcpd_db, backfname);
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/* Move in the new file... */
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if (rename (newfname, path_dhcpd_db) < 0)
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error ("Can't install new lease database %s to %s: %m",
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newfname, path_dhcpd_db);
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counting = 1;
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}
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