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#if !defined(lint) && !defined(SABER)
static char rcsid[] = "$Id: ns_udp.c,v 8.3 1996/08/27 08:33:23 vixie Exp $";
#endif /* not lint */
/*
* Copyright (c) 1996 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <syslog.h>
#include <netdb.h>
#include <nlist.h>
#include <resolv.h>
#include "named.h"
void
ns_udp() {
#if defined(CHECK_UDP_SUM) || defined(FIX_UDP_SUM)
struct nlist nl[2];
int fd;
int sum;
u_long res, offset;
nl[0].n_name = UDPSUM;
nl[1].n_name = 0;
if (nlist(KSYMS, nl)) {
dprintf(1, (ddt, "ns_udp: nlist (%s,%s) failed\n",
KSYMS, UDPSUM));
return;
}
dprintf(1, (ddt, "ns_udp: %s %d %lu (%ld)\n",
nl[0].n_name, nl[0].n_type, nl[0].n_value,
nl[0].n_value));
if (!nl[0].n_type)
return;
if ((fd = open(KMEM, O_RDWR, 0)) < 0) {
dprintf(1, (ddt, "ns_udp: open %s failed\n", KMEM));
return;
}
offset = nl[0].n_value;
#ifdef KMAP
offset &= ((~0UL)>>1);
#endif
res = lseek(fd, offset, SEEK_SET);
if (res != offset) {
dprintf(1, (ddt, "ns_udp: lseek %ul failed %lu %d\n",
offset, res, errno));
goto cleanup;
}
if (read(fd, &sum, sizeof(sum)) != sizeof(sum)) {
dprintf(1, (ddt, "ns_udp: read failed\n"));
goto cleanup;
}
dprintf(1, (ddt, "ns_udp: %d\n", sum));
if (sum == 0) {
#ifdef FIX_UDP_SUM
sum = 1;
lseek(fd, offset, SEEK_SET);
if (res != offset) {
dprintf(1, (ddt, "ns_udp: lseek %ul failed %lu %d\n",
offset, res, errno));
goto cleanup;
}
if (write(fd, &sum, sizeof(sum)) != sizeof(sum)) {
dprintf(1, (ddt, "ns_udp: write failed\n"));
goto cleanup;
}
dprintf(1, (ddt, "ns_udp: set to 1\n"));
syslog(LOG_WARNING, "ns_udp: check sums turned on");
#else
dprintf(1, (ddt, "ns_udp: Exiting\n"));
syslog(LOG_WARNING, "ns_udp: checksums NOT turned on: Exiting");
exit(1);
#endif
}
cleanup:
close(fd);
#endif
}
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