124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
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#if !defined(lint) && !defined(SABER)
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static char rcsid[] = "$Id: ns_udp.c,v 8.5 1997/05/21 19:52:26 halley Exp $";
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#endif /* not lint */
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/*
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* Copyright (c) 1996, 1997 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netdb.h>
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#include <nlist.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include <isc/eventlib.h>
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#include <isc/logging.h>
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#include "port_after.h"
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#include "named.h"
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void
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ns_udp() {
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#if defined(CHECK_UDP_SUM) || defined(FIX_UDP_SUM)
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struct nlist nl[2];
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int fd;
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int sum;
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u_long res, offset;
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nl[0].n_name = UDPSUM;
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nl[1].n_name = 0;
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if (nlist(KSYMS, nl)) {
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ns_debug(ns_log_default, 1, "ns_udp: nlist (%s,%s) failed",
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KSYMS, UDPSUM);
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return;
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}
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ns_debug(ns_log_default, 1, "ns_udp: %s %d %lu (%ld)",
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nl[0].n_name, nl[0].n_type, nl[0].n_value, nl[0].n_value);
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if (!nl[0].n_type)
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return;
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if ((fd = open(KMEM, O_RDWR, 0)) < 0) {
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ns_debug(ns_log_default, 1, "ns_udp: open %s failed: %s", KMEM,
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strerror(errno));
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return;
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}
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offset = nl[0].n_value;
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#ifdef KMAP
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offset &= ((~0UL)>>1);
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#endif
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res = lseek(fd, offset, SEEK_SET);
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if (res != offset) {
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ns_debug(ns_log_default, 1, "ns_udp: lseek %lu failed %lu: %s",
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offset, res, strerror(errno));
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goto cleanup;
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}
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if (read(fd, &sum, sizeof(sum)) != sizeof(sum)) {
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ns_debug(ns_log_default, 1, "ns_udp: read failed: %s",
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strerror(errno));
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goto cleanup;
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}
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ns_debug(ns_log_default, 1, "ns_udp: %d", sum);
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if (sum == 0) {
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#ifdef FIX_UDP_SUM
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sum = 1;
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lseek(fd, offset, SEEK_SET);
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if (res != offset) {
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ns_debug(ns_log_default, 1,
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"ns_udp: lseek %lu failed %lu: %s",
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offset, res, strerror(errno));
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goto cleanup;
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}
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if (write(fd, &sum, sizeof(sum)) != sizeof(sum)) {
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ns_debug(ns_log_default, 1, "ns_udp: write failed: %s",
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strerror(errno));
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goto cleanup;
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}
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ns_warning(ns_log_default, "ns_udp: check sums turned on");
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#else
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ns_panic(ns_log_default, 0,
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"ns_udp: checksums NOT turned on, exiting");
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#endif
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}
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cleanup:
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close(fd);
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#endif
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}
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