#include <config.h>
#include <stdlib.h>
#include <isc/mem.h>
#include <isc/region.h>
#include <isc/string.h>
#include <isc/util.h>
#include <dns/result.h>
#include <dns/rdata.h>
#include <dns/rdataset.h>
#include <dns/rdataslab.h>
static int
compare_rdata(const void *p1, const void *p2) {
const dns_rdata_t *rdata1 = p1;
const dns_rdata_t *rdata2 = p2;
return (dns_rdata_compare(rdata1, rdata2));
}
isc_result_t
dns_rdataslab_fromrdataset(dns_rdataset_t *rdataset, isc_mem_t *mctx,
isc_region_t *region, unsigned int reservelen)
{
dns_rdata_t *rdatas;
unsigned char *rawbuf;
unsigned int buflen;
isc_result_t result;
unsigned int nitems;
unsigned int nalloc;
unsigned int i;
buflen = reservelen + 2;
nalloc = dns_rdataset_count(rdataset);
nitems = nalloc;
if (nitems == 0)
return (ISC_R_FAILURE);
rdatas = isc_mem_get(mctx, nalloc * sizeof(dns_rdata_t));
if (rdatas == NULL)
return (ISC_R_NOMEMORY);
result = dns_rdataset_first(rdataset);
if (result != ISC_R_SUCCESS)
goto free_rdatas;
for (i = 0; i < nalloc && result == ISC_R_SUCCESS; i++) {
INSIST(result == ISC_R_SUCCESS);
dns_rdata_init(&rdatas[i]);
dns_rdataset_current(rdataset, &rdatas[i]);
result = dns_rdataset_next(rdataset);
}
if (result != ISC_R_NOMORE)
goto free_rdatas;
if (i != nalloc) {
result = ISC_R_FAILURE;
goto free_rdatas;
}
qsort(rdatas, nalloc, sizeof(dns_rdata_t), compare_rdata);
for (i = 1; i < nalloc; i++) {
if (compare_rdata(&rdatas[i-1], &rdatas[i]) == 0) {
rdatas[i-1].data = NULL;
rdatas[i-1].length = 0;
nitems--;
} else
buflen += (2 + rdatas[i-1].length);
}
buflen += (2 + rdatas[i-1].length);
if (nitems > 1 && dns_rdatatype_issingleton(rdataset->type)) {
result = DNS_R_SINGLETON;
goto free_rdatas;
}
rawbuf = isc_mem_get(mctx, buflen);
if (rawbuf == NULL) {
result = ISC_R_NOMEMORY;
goto free_rdatas;
}
region->base = rawbuf;
region->length = buflen;
rawbuf += reservelen;
*rawbuf++ = (nitems & 0xff00) >> 8;
*rawbuf++ = (nitems & 0x00ff);
for (i = 0; i < nalloc; i++) {
if (rdatas[i].data == NULL)
continue;
*rawbuf++ = (rdatas[i].length & 0xff00) >> 8;
*rawbuf++ = (rdatas[i].length & 0x00ff);
memcpy(rawbuf, rdatas[i].data, rdatas[i].length);
rawbuf += rdatas[i].length;
}
result = ISC_R_SUCCESS;
free_rdatas:
isc_mem_put(mctx, rdatas, nalloc * sizeof(dns_rdata_t));
return (result);
}
unsigned int
dns_rdataslab_size(unsigned char *slab, unsigned int reservelen) {
unsigned int count, length;
unsigned char *current;
REQUIRE(slab != NULL);
current = slab + reservelen;
count = *current++ * 256;
count += *current++;
while (count > 0) {
count--;
length = *current++ * 256;
length += *current++;
current += length;
}
return ((unsigned int)(current - slab));
}
static inline void
rdata_from_slab(unsigned char **current,
dns_rdataclass_t rdclass, dns_rdatatype_t type,
dns_rdata_t *rdata)
{
unsigned char *tcurrent = *current;
isc_region_t region;
region.length = *tcurrent++ * 256;
region.length += *tcurrent++;
region.base = tcurrent;
tcurrent += region.length;
dns_rdata_fromregion(rdata, rdclass, type, ®ion);
*current = tcurrent;
}
static inline isc_boolean_t
rdata_in_slab(unsigned char *slab, unsigned int reservelen,
dns_rdataclass_t rdclass, dns_rdatatype_t type,
dns_rdata_t *rdata)
{
unsigned int count, i;
unsigned char *current;
dns_rdata_t trdata = DNS_RDATA_INIT;
current = slab + reservelen;
count = *current++ * 256;
count += *current++;
for (i = 0; i < count; i++) {
rdata_from_slab(¤t, rdclass, type, &trdata);
if (dns_rdata_compare(&trdata, rdata) == 0)
return (ISC_TRUE);
dns_rdata_reset(&trdata);
}
return (ISC_FALSE);
}
isc_result_t
dns_rdataslab_merge(unsigned char *oslab, unsigned char *nslab,
unsigned int reservelen, isc_mem_t *mctx,
dns_rdataclass_t rdclass, dns_rdatatype_t type,
unsigned int flags, unsigned char **tslabp)
{
unsigned char *ocurrent, *ostart, *ncurrent, *tstart, *tcurrent;
unsigned int ocount, ncount, count, olength, tlength, tcount, length;
isc_region_t nregion;
dns_rdata_t ordata = DNS_RDATA_INIT;
dns_rdata_t nrdata = DNS_RDATA_INIT;
isc_boolean_t added_something = ISC_FALSE;
unsigned int oadded = 0;
unsigned int nadded = 0;
unsigned int nncount = 0;
REQUIRE(tslabp != NULL && *tslabp == NULL);
REQUIRE(oslab != NULL && nslab != NULL);
ocurrent = oslab + reservelen;
ocount = *ocurrent++ * 256;
ocount += *ocurrent++;
ostart = ocurrent;
ncurrent = nslab + reservelen;
ncount = *ncurrent++ * 256;
ncount += *ncurrent++;
INSIST(ocount > 0 && ncount > 0);
olength = 0;
for (count = 0; count < ocount; count++) {
length = *ocurrent++ * 256;
length += *ocurrent++;
olength += length + 2;
ocurrent += length;
}
tlength = reservelen + 2 + olength;
tcount = ocount;
do {
nregion.length = *ncurrent++ * 256;
nregion.length += *ncurrent++;
nregion.base = ncurrent;
dns_rdata_init(&nrdata);
dns_rdata_fromregion(&nrdata, rdclass, type, &nregion);
if (!rdata_in_slab(oslab, reservelen, rdclass, type, &nrdata))
{
tlength += nregion.length + 2;
tcount++;
nncount++;
added_something = ISC_TRUE;
}
ncurrent += nregion.length;
ncount--;
} while (ncount > 0);
ncount = nncount;
if (((flags & DNS_RDATASLAB_EXACT) != 0) &&
(tcount != ncount + ocount))
return (DNS_R_NOTEXACT);
if (!added_something && (flags & DNS_RDATASLAB_FORCE) == 0)
return (DNS_R_UNCHANGED);
if (tcount > 1 && dns_rdatatype_issingleton(type)) {
return (DNS_R_SINGLETON);
}
tstart = isc_mem_get(mctx, tlength);
if (tstart == NULL)
return (ISC_R_NOMEMORY);
memcpy(tstart, nslab, reservelen);
tcurrent = tstart + reservelen;
*tcurrent++ = (tcount & 0xff00) >> 8;
*tcurrent++ = (tcount & 0x00ff);
ocurrent = ostart;
INSIST(ocount != 0);
rdata_from_slab(&ocurrent, rdclass, type, &ordata);
ncurrent = nslab + reservelen + 2;
if (ncount > 0) {
do {
dns_rdata_reset(&nrdata);
rdata_from_slab(&ncurrent, rdclass, type, &nrdata);
} while (rdata_in_slab(oslab, reservelen, rdclass,
type, &nrdata));
}
while (oadded < ocount || nadded < ncount) {
isc_boolean_t fromold;
if (oadded == ocount)
fromold = ISC_FALSE;
else if (nadded == ncount)
fromold = ISC_TRUE;
else
fromold = ISC_TF(compare_rdata(&ordata, &nrdata) < 0);
if (fromold) {
length = ordata.length;
*tcurrent++ = (length & 0xff00) >> 8;
*tcurrent++ = (length & 0x00ff);
memcpy(tcurrent, ordata.data, length);
tcurrent += length;
oadded++;
if (oadded < ocount) {
dns_rdata_reset(&ordata);
rdata_from_slab(&ocurrent, rdclass, type,
&ordata);
}
} else {
length = nrdata.length;
*tcurrent++ = (length & 0xff00) >> 8;
*tcurrent++ = (length & 0x00ff);
memcpy(tcurrent, nrdata.data, length);
tcurrent += length;
nadded++;
if (nadded < ncount) {
do {
dns_rdata_reset(&nrdata);
rdata_from_slab(&ncurrent, rdclass,
type, &nrdata);
} while (rdata_in_slab(oslab, reservelen,
rdclass, type,
&nrdata));
}
}
}
INSIST(tcurrent == tstart + tlength);
*tslabp = tstart;
return (ISC_R_SUCCESS);
}
isc_result_t
dns_rdataslab_subtract(unsigned char *mslab, unsigned char *sslab,
unsigned int reservelen, isc_mem_t *mctx,
dns_rdataclass_t rdclass, dns_rdatatype_t type,
unsigned int flags, unsigned char **tslabp)
{
unsigned char *mcurrent, *sstart, *scurrent, *tstart, *tcurrent;
unsigned int mcount, scount, rcount ,count, tlength, tcount;
dns_rdata_t srdata = DNS_RDATA_INIT;
dns_rdata_t mrdata = DNS_RDATA_INIT;
REQUIRE(tslabp != NULL && *tslabp == NULL);
REQUIRE(mslab != NULL && sslab != NULL);
mcurrent = mslab + reservelen;
mcount = *mcurrent++ * 256;
mcount += *mcurrent++;
scurrent = sslab + reservelen;
scount = *scurrent++ * 256;
scount += *scurrent++;
sstart = scurrent;
INSIST(mcount > 0 && scount > 0);
tlength = reservelen + 2;
tcount = 0;
rcount = 0;
do {
unsigned char *mrdatabegin = mcurrent;
rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
scurrent = sstart;
for (count = 0; count < scount; count++) {
dns_rdata_reset(&srdata);
rdata_from_slab(&scurrent, rdclass, type, &srdata);
if (dns_rdata_compare(&mrdata, &srdata) == 0)
break;
}
if (count == scount) {
tlength += mcurrent - mrdatabegin;
tcount++;
} else
rcount++;
mcount--;
dns_rdata_reset(&mrdata);
} while (mcount > 0);
if (((flags & DNS_RDATASLAB_EXACT) != 0) && (rcount != scount))
return (DNS_R_NOTEXACT);
if (tcount == 0)
return (DNS_R_NXRRSET);
if (rcount == 0)
return (DNS_R_UNCHANGED);
tstart = isc_mem_get(mctx, tlength);
if (tstart == NULL)
return (ISC_R_NOMEMORY);
memcpy(tstart, mslab, reservelen);
tcurrent = tstart + reservelen;
*tcurrent++ = (tcount & 0xff00) >> 8;
*tcurrent++ = (tcount & 0x00ff);
mcurrent = mslab + reservelen;
mcount = *mcurrent++ * 256;
mcount += *mcurrent++;
do {
unsigned char *mrdatabegin = mcurrent;
rdata_from_slab(&mcurrent, rdclass, type, &mrdata);
scurrent = sstart;
for (count = 0; count < scount; count++) {
dns_rdata_reset(&srdata);
rdata_from_slab(&scurrent, rdclass, type, &srdata);
if (dns_rdata_compare(&mrdata, &srdata) == 0)
break;
}
if (count == scount) {
unsigned int length = mcurrent - mrdatabegin;
memcpy(tcurrent, mrdatabegin, length);
tcurrent += length;
}
dns_rdata_reset(&mrdata);
mcount--;
} while (mcount > 0);
INSIST(tcurrent == tstart + tlength);
*tslabp = tstart;
return (ISC_R_SUCCESS);
}
isc_boolean_t
dns_rdataslab_equal(unsigned char *slab1, unsigned char *slab2,
unsigned int reservelen)
{
unsigned char *current1, *current2;
unsigned int count1, count2;
unsigned int length1, length2;
current1 = slab1 + reservelen;
count1 = *current1++ * 256;
count1 += *current1++;
current2 = slab2 + reservelen;
count2 = *current2++ * 256;
count2 += *current2++;
if (count1 != count2)
return (ISC_FALSE);
while (count1 > 0) {
length1 = *current1++ * 256;
length1 += *current1++;
length2 = *current2++ * 256;
length2 += *current2++;
if (length1 != length2 ||
memcmp(current1, current2, length1) != 0)
return (ISC_FALSE);
current1 += length1;
current2 += length1;
count1--;
}
return (ISC_TRUE);
}