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difffile.c
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difffile.c
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/*
* difffile.c - DIFF file handling source code. Read and write diff files.
*
* Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
*/
#include "config.h"
#include <assert.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include "difffile.h"
#include "xfrd-disk.h"
#include "util.h"
#include "packet.h"
#include "rdata.h"
#include "udb.h"
#include "nsec3.h"
#include "nsd.h"
#include "rrl.h"
#include "ixfr.h"
#include "zonec.h"
#include "xfrd-catalog-zones.h"
static int
write_64(FILE *out, uint64_t val)
{
return write_data(out, &val, sizeof(val));
}
static int
write_32(FILE *out, uint32_t val)
{
val = htonl(val);
return write_data(out, &val, sizeof(val));
}
static int
write_8(FILE *out, uint8_t val)
{
return write_data(out, &val, sizeof(val));
}
static int
write_str(FILE *out, const char* str)
{
uint32_t len = strlen(str);
if(!write_32(out, len))
return 0;
return write_data(out, str, len);
}
void
diff_write_packet(const char* zone, const char* pat, uint32_t old_serial,
uint32_t new_serial, uint32_t seq_nr, uint8_t* data, size_t len,
struct nsd* nsd, uint64_t filenumber)
{
FILE* df = xfrd_open_xfrfile(nsd, filenumber, seq_nr?"a":"w");
if(!df) {
log_msg(LOG_ERR, "could not open transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
return;
}
/* if first part, first write the header */
if(seq_nr == 0) {
struct timeval tv;
if (gettimeofday(&tv, NULL) != 0) {
log_msg(LOG_ERR, "could not get timestamp for %s: %s",
zone, strerror(errno));
}
if(!write_32(df, DIFF_PART_XFRF) ||
!write_8(df, 0) /* notcommitted(yet) */ ||
!write_32(df, 0) /* numberofparts when done */ ||
!write_64(df, (uint64_t) tv.tv_sec) ||
!write_32(df, (uint32_t) tv.tv_usec) ||
!write_32(df, old_serial) ||
!write_32(df, new_serial) ||
!write_64(df, (uint64_t) tv.tv_sec) ||
!write_32(df, (uint32_t) tv.tv_usec) ||
!write_str(df, zone) ||
!write_str(df, pat)) {
log_msg(LOG_ERR, "could not write transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
fclose(df);
return;
}
}
if(!write_32(df, DIFF_PART_XXFR) ||
!write_32(df, len) ||
!write_data(df, data, len) ||
!write_32(df, len))
{
log_msg(LOG_ERR, "could not write transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
}
fclose(df);
}
void
diff_write_commit(const char* zone, uint32_t old_serial, uint32_t new_serial,
uint32_t num_parts, uint8_t commit, const char* log_str,
struct nsd* nsd, uint64_t filenumber)
{
struct timeval tv;
FILE* df;
if (gettimeofday(&tv, NULL) != 0) {
log_msg(LOG_ERR, "could not set timestamp for %s: %s",
zone, strerror(errno));
}
/* overwrite the first part of the file with 'committed = 1',
* as well as the end_time and number of parts.
* also write old_serial and new_serial, so that a bad file mixup
* will result in unusable serial numbers. */
df = xfrd_open_xfrfile(nsd, filenumber, "r+");
if(!df) {
log_msg(LOG_ERR, "could not open transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
return;
}
if(!write_32(df, DIFF_PART_XFRF) ||
!write_8(df, commit) /* committed */ ||
!write_32(df, num_parts) ||
!write_64(df, (uint64_t) tv.tv_sec) ||
!write_32(df, (uint32_t) tv.tv_usec) ||
!write_32(df, old_serial) ||
!write_32(df, new_serial))
{
log_msg(LOG_ERR, "could not write transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
fclose(df);
return;
}
/* append the log_str to the end of the file */
if(fseek(df, 0, SEEK_END) == -1) {
log_msg(LOG_ERR, "could not fseek transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
fclose(df);
return;
}
if(!write_str(df, log_str)) {
log_msg(LOG_ERR, "could not write transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
fclose(df);
return;
}
fflush(df);
fclose(df);
}
void
diff_update_commit(
const char* zone, uint8_t commit, struct nsd* nsd, uint64_t filenumber)
{
FILE *df;
assert(zone != NULL);
assert(nsd != NULL);
assert(commit == DIFF_NOT_COMMITTED ||
commit == DIFF_COMMITTED ||
commit == DIFF_CORRUPT ||
commit == DIFF_INCONSISTENT ||
commit == DIFF_VERIFIED);
df = xfrd_open_xfrfile(nsd, filenumber, "r+");
if(!df) {
log_msg(LOG_ERR, "could not open transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
return;
}
if(!write_32(df, DIFF_PART_XFRF) || !write_8(df, commit)) {
log_msg(LOG_ERR, "could not write transfer %s file %lld: %s",
zone, (long long)filenumber, strerror(errno));
fclose(df);
return;
}
fflush(df);
fclose(df);
}
int
diff_read_64(FILE *in, uint64_t* result)
{
if (fread(result, sizeof(*result), 1, in) == 1) {
return 1;
} else {
return 0;
}
}
int
diff_read_32(FILE *in, uint32_t* result)
{
if (fread(result, sizeof(*result), 1, in) == 1) {
*result = ntohl(*result);
return 1;
} else {
return 0;
}
}
int
diff_read_8(FILE *in, uint8_t* result)
{
if (fread(result, sizeof(*result), 1, in) == 1) {
return 1;
} else {
return 0;
}
}
int
diff_read_str(FILE* in, char* buf, size_t len)
{
uint32_t disklen;
if(!diff_read_32(in, &disklen))
return 0;
if(disklen >= len)
return 0;
if(fread(buf, disklen, 1, in) != 1)
return 0;
buf[disklen] = 0;
return 1;
}
static void
add_rdata_to_recyclebin(namedb_type* db, rr_type* rr)
{
/* add rdatas to recycle bin. */
size_t i;
for(i=0; i<rr->rdata_count; i++)
{
if(!rdata_atom_is_domain(rr->type, i))
region_recycle(db->region, rr->rdatas[i].data,
rdata_atom_size(rr->rdatas[i])
+ sizeof(uint16_t));
}
region_recycle(db->region, rr->rdatas,
sizeof(rdata_atom_type)*rr->rdata_count);
}
/* this routine determines if below a domain there exist names with
* data (is_existing) or no names below the domain have data.
*/
static int
has_data_below(domain_type* top)
{
domain_type* d = top;
assert(d != NULL);
/* in the canonical ordering subdomains are after this name */
d = domain_next(d);
while(d != NULL && domain_is_subdomain(d, top)) {
if(d->is_existing)
return 1;
d = domain_next(d);
}
return 0;
}
/** check if domain with 0 rrsets has become empty (nonexist) */
static domain_type*
rrset_zero_nonexist_check(domain_type* domain, domain_type* ce)
{
/* is the node now an empty node (completely deleted) */
if(domain->rrsets == 0) {
/* if there is no data below it, it becomes non existing.
also empty nonterminals above it become nonexisting */
/* check for data below this node. */
if(!has_data_below(domain)) {
/* nonexist this domain and all parent empty nonterminals */
domain_type* p = domain;
while(p != NULL && p->rrsets == 0) {
if(p == ce || has_data_below(p))
return p;
p->is_existing = 0;
/* fixup wildcard child of parent */
if(p->parent &&
p->parent->wildcard_child_closest_match == p)
p->parent->wildcard_child_closest_match = domain_previous_existing_child(p);
p = p->parent;
}
}
}
return NULL;
}
/** remove rrset. Adjusts zone params. Does not remove domain */
static void
rrset_delete(namedb_type* db, domain_type* domain, rrset_type* rrset)
{
int i;
/* find previous */
rrset_type** pp = &domain->rrsets;
while(*pp && *pp != rrset) {
pp = &( (*pp)->next );
}
if(!*pp) {
/* rrset does not exist for domain */
return;
}
*pp = rrset->next;
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "delete rrset of %s type %s",
domain_to_string(domain),
rrtype_to_string(rrset_rrtype(rrset))));
/* is this a SOA rrset ? */
if(rrset->zone->soa_rrset == rrset) {
rrset->zone->soa_rrset = 0;
}
if(rrset->zone->ns_rrset == rrset) {
rrset->zone->ns_rrset = 0;
}
if(domain == rrset->zone->apex && rrset_rrtype(rrset) == TYPE_RRSIG) {
for (i = 0; i < rrset->rr_count; ++i) {
if(rr_rrsig_type_covered(&rrset->rrs[i])==TYPE_DNSKEY) {
rrset->zone->is_secure = 0;
break;
}
}
}
/* recycle the memory space of the rrset */
for (i = 0; i < rrset->rr_count; ++i)
add_rdata_to_recyclebin(db, &rrset->rrs[i]);
region_recycle(db->region, rrset->rrs,
sizeof(rr_type) * rrset->rr_count);
rrset->rr_count = 0;
region_recycle(db->region, rrset, sizeof(rrset_type));
}
static int
rdatas_equal(rdata_atom_type *a, rdata_atom_type *b, int num, uint16_t type,
int* rdnum, char** reason)
{
int k, start, end;
start = 0;
end = num;
/**
* SOA RDATA comparisons in XFR are more lenient,
* only serial rdata is checked.
**/
if (type == TYPE_SOA) {
start = 2;
end = 3;
}
for(k = start; k < end; k++)
{
if(rdata_atom_is_domain(type, k)) {
if(dname_compare(domain_dname(a[k].domain),
domain_dname(b[k].domain))!=0) {
*rdnum = k;
*reason = "dname data";
return 0;
}
} else if(rdata_atom_is_literal_domain(type, k)) {
/* literal dname, but compare case insensitive */
if(a[k].data[0] != b[k].data[0]) {
*rdnum = k;
*reason = "literal dname len";
return 0; /* uncompressed len must be equal*/
}
if(!dname_equal_nocase((uint8_t*)(a[k].data+1),
(uint8_t*)(b[k].data+1), a[k].data[0])) {
*rdnum = k;
*reason = "literal dname data";
return 0;
}
} else {
/* check length */
if(a[k].data[0] != b[k].data[0]) {
*rdnum = k;
*reason = "rdata len";
return 0;
}
/* check data */
if(memcmp(a[k].data+1, b[k].data+1, a[k].data[0])!=0) {
*rdnum = k;
*reason = "rdata data";
return 0;
}
}
}
return 1;
}
static void
debug_find_rr_num(rrset_type* rrset, uint16_t type, uint16_t klass,
rdata_atom_type *rdatas, ssize_t rdata_num)
{
int i, rd;
char* reason = "";
for(i=0; i < rrset->rr_count; ++i) {
if (rrset->rrs[i].type != type) {
log_msg(LOG_WARNING, "diff: RR <%s, %s> does not match "
"RR num %d type %s",
dname_to_string(domain_dname(rrset->rrs[i].owner),0),
rrtype_to_string(type), i,
rrtype_to_string(rrset->rrs[i].type));
}
if (rrset->rrs[i].klass != klass) {
log_msg(LOG_WARNING, "diff: RR <%s, %s> class %d "
"does not match RR num %d class %d",
dname_to_string(domain_dname(rrset->rrs[i].owner),0),
rrtype_to_string(type),
klass, i,
rrset->rrs[i].klass);
}
if (rrset->rrs[i].rdata_count != rdata_num) {
log_msg(LOG_WARNING, "diff: RR <%s, %s> rdlen %u "
"does not match RR num %d rdlen %d",
dname_to_string(domain_dname(rrset->rrs[i].owner),0),
rrtype_to_string(type),
(unsigned) rdata_num, i,
(unsigned) rrset->rrs[i].rdata_count);
}
if (!rdatas_equal(rdatas, rrset->rrs[i].rdatas, rdata_num, type,
&rd, &reason)) {
log_msg(LOG_WARNING, "diff: RR <%s, %s> rdata element "
"%d differs from RR num %d rdata (%s)",
dname_to_string(domain_dname(rrset->rrs[i].owner),0),
rrtype_to_string(type),
rd, i, reason);
}
}
}
static int
find_rr_num(rrset_type* rrset, uint16_t type, uint16_t klass,
rdata_atom_type *rdatas, ssize_t rdata_num, int add)
{
int i, rd;
char* reason;
for(i=0; i < rrset->rr_count; ++i) {
if(rrset->rrs[i].type == type &&
rrset->rrs[i].klass == klass &&
rrset->rrs[i].rdata_count == rdata_num &&
rdatas_equal(rdatas, rrset->rrs[i].rdatas, rdata_num, type,
&rd, &reason))
{
return i;
}
}
/* this is odd. Log why rr cannot be found. */
if (!add) {
debug_find_rr_num(rrset, type, klass, rdatas, rdata_num);
}
return -1;
}
#ifdef NSEC3
/* see if nsec3 deletion triggers need action */
static void
nsec3_delete_rr_trigger(namedb_type* db, rr_type* rr, zone_type* zone)
{
/* the RR has not actually been deleted yet, so we can inspect it */
if(!zone->nsec3_param)
return;
/* see if the domain was an NSEC3-domain in the chain, but no longer */
if(rr->type == TYPE_NSEC3 && rr->owner->nsec3 &&
rr->owner->nsec3->nsec3_node.key &&
nsec3_rr_uses_params(rr, zone) &&
nsec3_in_chain_count(rr->owner, zone) <= 1) {
domain_type* prev = nsec3_chain_find_prev(zone, rr->owner);
/* remove from prehash because no longer an NSEC3 domain */
if(domain_is_prehash(db->domains, rr->owner))
prehash_del(db->domains, rr->owner);
/* fixup the last in the zone */
if(rr->owner == zone->nsec3_last)
zone->nsec3_last = prev;
/* unlink from the nsec3tree */
zone_del_domain_in_hash_tree(zone->nsec3tree,
&rr->owner->nsec3->nsec3_node);
/* add previous NSEC3 to the prehash list */
if(prev && prev != rr->owner)
prehash_add(db->domains, prev);
else nsec3_clear_precompile(db, zone);
/* this domain becomes ordinary data domain: done later */
}
/* see if the rr was NSEC3PARAM that we were using */
else if(rr->type == TYPE_NSEC3PARAM && rr == zone->nsec3_param) {
/* clear trees, wipe hashes, wipe precompile */
nsec3_clear_precompile(db, zone);
/* pick up new nsec3param (from udb, or avoid deleted rr) */
nsec3_find_zone_param(db, zone, rr, 0);
/* if no more NSEC3, done */
if(!zone->nsec3_param)
return;
nsec3_precompile_newparam(db, zone);
}
}
/* see if nsec3 prehash can be removed with new rrset content */
static void
nsec3_rrsets_changed_remove_prehash(domain_type* domain, zone_type* zone)
{
/* deletion of rrset already done, we can check if conditions apply */
/* see if the domain is no longer precompiled */
/* it has a hash_node, but no longer fulfills conditions */
if(nsec3_domain_part_of_zone(domain, zone) && domain->nsec3 &&
domain->nsec3->hash_wc &&
domain->nsec3->hash_wc->hash.node.key &&
!nsec3_condition_hash(domain, zone)) {
/* remove precompile */
domain->nsec3->nsec3_cover = NULL;
domain->nsec3->nsec3_wcard_child_cover = NULL;
domain->nsec3->nsec3_is_exact = 0;
/* remove it from the hash tree */
zone_del_domain_in_hash_tree(zone->hashtree,
&domain->nsec3->hash_wc->hash.node);
zone_del_domain_in_hash_tree(zone->wchashtree,
&domain->nsec3->hash_wc->wc.node);
}
if(domain != zone->apex && domain->nsec3 &&
domain->nsec3->ds_parent_hash &&
domain->nsec3->ds_parent_hash->node.key &&
(!domain->parent || nsec3_domain_part_of_zone(domain->parent, zone)) &&
!nsec3_condition_dshash(domain, zone)) {
/* remove precompile */
domain->nsec3->nsec3_ds_parent_cover = NULL;
domain->nsec3->nsec3_ds_parent_is_exact = 0;
/* remove it from the hash tree */
zone_del_domain_in_hash_tree(zone->dshashtree,
&domain->nsec3->ds_parent_hash->node);
}
}
/* see if domain needs to get precompiled info */
static void
nsec3_rrsets_changed_add_prehash(namedb_type* db, domain_type* domain,
zone_type* zone)
{
if(!zone->nsec3_param)
return;
if((!domain->nsec3 || !domain->nsec3->hash_wc
|| !domain->nsec3->hash_wc->hash.node.key)
&& nsec3_condition_hash(domain, zone)) {
region_type* tmpregion = region_create(xalloc, free);
nsec3_precompile_domain(db, domain, zone, tmpregion);
region_destroy(tmpregion);
}
if((!domain->nsec3 || !domain->nsec3->ds_parent_hash
|| !domain->nsec3->ds_parent_hash->node.key)
&& nsec3_condition_dshash(domain, zone)) {
nsec3_precompile_domain_ds(db, domain, zone);
}
}
/* see if nsec3 rrset-deletion triggers need action */
static void
nsec3_delete_rrset_trigger(namedb_type* db, domain_type* domain,
zone_type* zone, uint16_t type)
{
if(!zone->nsec3_param)
return;
nsec3_rrsets_changed_remove_prehash(domain, zone);
/* for type nsec3, or a delegation, the domain may have become a
* 'normal' domain with its remaining data now */
if(type == TYPE_NSEC3 || type == TYPE_NS || type == TYPE_DS)
nsec3_rrsets_changed_add_prehash(db, domain, zone);
/* for type DNAME or a delegation, obscured data may be revealed */
if(type == TYPE_NS || type == TYPE_DS || type == TYPE_DNAME) {
/* walk over subdomains and check them each */
domain_type *d;
for(d=domain_next(domain); d && domain_is_subdomain(d, domain);
d=domain_next(d)) {
nsec3_rrsets_changed_add_prehash(db, d, zone);
}
}
}
/* see if nsec3 addition triggers need action */
static void
nsec3_add_rr_trigger(namedb_type* db, rr_type* rr, zone_type* zone)
{
/* the RR has been added in full, also to UDB (and thus NSEC3PARAM
* in the udb has been adjusted) */
if(zone->nsec3_param && rr->type == TYPE_NSEC3 &&
(!rr->owner->nsec3 || !rr->owner->nsec3->nsec3_node.key)
&& nsec3_rr_uses_params(rr, zone)) {
if(!zone->nsec3_last) {
/* all nsec3s have previously been deleted, but
* we have nsec3 parameters, set it up again from
* being cleared. */
nsec3_precompile_newparam(db, zone);
}
/* added NSEC3 into the chain */
nsec3_precompile_nsec3rr(db, rr->owner, zone);
/* the domain has become an NSEC3-domain, if it was precompiled
* previously, remove that, neatly done in routine above */
nsec3_rrsets_changed_remove_prehash(rr->owner, zone);
/* set this NSEC3 to prehash */
prehash_add(db->domains, rr->owner);
} else if(!zone->nsec3_param && rr->type == TYPE_NSEC3PARAM) {
/* see if this means NSEC3 chain can be used */
nsec3_find_zone_param(db, zone, NULL, 0);
if(!zone->nsec3_param)
return;
nsec3_zone_trees_create(db->region, zone);
nsec3_precompile_newparam(db, zone);
}
}
/* see if nsec3 rrset-addition triggers need action */
static void
nsec3_add_rrset_trigger(namedb_type* db, domain_type* domain, zone_type* zone,
uint16_t type)
{
/* the rrset has been added so we can inspect it */
if(!zone->nsec3_param)
return;
/* because the rrset is added we can check conditions easily.
* check if domain needs to become precompiled now */
nsec3_rrsets_changed_add_prehash(db, domain, zone);
/* if a delegation, it changes from normal name to unhashed referral */
if(type == TYPE_NS || type == TYPE_DS) {
nsec3_rrsets_changed_remove_prehash(domain, zone);
}
/* if delegation or DNAME added, then some RRs may get obscured */
if(type == TYPE_NS || type == TYPE_DS || type == TYPE_DNAME) {
/* walk over subdomains and check them each */
domain_type *d;
for(d=domain_next(domain); d && domain_is_subdomain(d, domain);
d=domain_next(d)) {
nsec3_rrsets_changed_remove_prehash(d, zone);
}
}
}
#endif /* NSEC3 */
/* fixup usage lower for domain names in the rdata */
static void
rr_lower_usage(namedb_type* db, rr_type* rr)
{
unsigned i;
for(i=0; i<rr->rdata_count; i++) {
if(rdata_atom_is_domain(rr->type, i)) {
assert(rdata_atom_domain(rr->rdatas[i])->usage > 0);
rdata_atom_domain(rr->rdatas[i])->usage --;
if(rdata_atom_domain(rr->rdatas[i])->usage == 0)
domain_table_deldomain(db,
rdata_atom_domain(rr->rdatas[i]));
}
}
}
static void
rrset_lower_usage(namedb_type* db, rrset_type* rrset)
{
unsigned i;
for(i=0; i<rrset->rr_count; i++)
rr_lower_usage(db, &rrset->rrs[i]);
}
int
delete_RR(namedb_type* db, const dname_type* dname,
uint16_t type, uint16_t klass,
buffer_type* packet, size_t rdatalen, zone_type *zone,
region_type* temp_region, int* softfail)
{
domain_type *domain;
rrset_type *rrset;
domain = domain_table_find(db->domains, dname);
if(!domain) {
log_msg(LOG_WARNING, "diff: domain %s does not exist",
dname_to_string(dname,0));
buffer_skip(packet, rdatalen);
*softfail = 1;
return 1; /* not fatal error */
}
rrset = domain_find_rrset(domain, zone, type);
if(!rrset) {
log_msg(LOG_WARNING, "diff: rrset %s does not exist",
dname_to_string(dname,0));
buffer_skip(packet, rdatalen);
*softfail = 1;
return 1; /* not fatal error */
} else {
/* find the RR in the rrset */
domain_table_type *temptable;
rdata_atom_type *rdatas;
ssize_t rdata_num;
int rrnum;
temptable = domain_table_create(temp_region);
/* This will ensure that the dnames in rdata are
* normalized, conform RFC 4035, section 6.2
*/
rdata_num = rdata_wireformat_to_rdata_atoms(
temp_region, temptable, type, rdatalen, packet, &rdatas);
if(rdata_num == -1) {
log_msg(LOG_ERR, "diff: bad rdata for %s",
dname_to_string(dname,0));
return 0;
}
rrnum = find_rr_num(rrset, type, klass, rdatas, rdata_num, 0);
if(rrnum == -1 && type == TYPE_SOA && domain == zone->apex
&& rrset->rr_count != 0)
rrnum = 0; /* replace existing SOA if no match */
if(rrnum == -1) {
log_msg(LOG_WARNING, "diff: RR <%s, %s> does not exist",
dname_to_string(dname,0), rrtype_to_string(type));
*softfail = 1;
return 1; /* not fatal error */
}
#ifdef NSEC3
/* process triggers for RR deletions */
nsec3_delete_rr_trigger(db, &rrset->rrs[rrnum], zone);
#endif
/* lower usage (possibly deleting other domains, and thus
* invalidating the current RR's domain pointers) */
rr_lower_usage(db, &rrset->rrs[rrnum]);
if(rrset->rr_count == 1) {
/* delete entire rrset */
rrset_delete(db, domain, rrset);
/* check if domain is now nonexisting (or parents) */
rrset_zero_nonexist_check(domain, NULL);
#ifdef NSEC3
/* cleanup nsec3 */
nsec3_delete_rrset_trigger(db, domain, zone, type);
#endif
/* see if the domain can be deleted (and inspect parents) */
domain_table_deldomain(db, domain);
} else {
/* swap out the bad RR and decrease the count */
rr_type* rrs_orig = rrset->rrs;
add_rdata_to_recyclebin(db, &rrset->rrs[rrnum]);
if(rrnum < rrset->rr_count-1)
rrset->rrs[rrnum] = rrset->rrs[rrset->rr_count-1];
memset(&rrset->rrs[rrset->rr_count-1], 0, sizeof(rr_type));
/* realloc the rrs array one smaller */
rrset->rrs = region_alloc_array_init(db->region, rrs_orig,
(rrset->rr_count-1), sizeof(rr_type));
if(!rrset->rrs) {
log_msg(LOG_ERR, "out of memory, %s:%d", __FILE__, __LINE__);
exit(1);
}
region_recycle(db->region, rrs_orig,
sizeof(rr_type) * rrset->rr_count);
#ifdef NSEC3
if(type == TYPE_NSEC3PARAM && zone->nsec3_param) {
/* fixup nsec3_param pointer to same RR */
assert(zone->nsec3_param >= rrs_orig &&
zone->nsec3_param <=
rrs_orig+rrset->rr_count);
/* last moved to rrnum, others at same index*/
if(zone->nsec3_param == &rrs_orig[
rrset->rr_count-1])
zone->nsec3_param = &rrset->rrs[rrnum];
else
zone->nsec3_param =
(void*)zone->nsec3_param
-(void*)rrs_orig +
(void*)rrset->rrs;
}
#endif /* NSEC3 */
rrset->rr_count --;
#ifdef NSEC3
/* for type nsec3, the domain may have become a
* 'normal' domain with its remaining data now */
if(type == TYPE_NSEC3)
nsec3_rrsets_changed_add_prehash(db, domain,
zone);
#endif /* NSEC3 */
}
}
return 1;
}
int
add_RR(namedb_type* db, const dname_type* dname,
uint16_t type, uint16_t klass, uint32_t ttl,
buffer_type* packet, size_t rdatalen, zone_type *zone,
int* softfail)
{
domain_type* domain;
rrset_type* rrset;
rdata_atom_type *rdatas;
rr_type *rrs_old;
ssize_t rdata_num;
int rrnum;
#ifdef NSEC3
int rrset_added = 0;
#endif
domain = domain_table_find(db->domains, dname);
if(!domain) {
/* create the domain */
domain = domain_table_insert(db->domains, dname);
}
rrset = domain_find_rrset(domain, zone, type);
if(!rrset) {
/* create the rrset */
rrset = region_alloc(db->region, sizeof(rrset_type));
if(!rrset) {
log_msg(LOG_ERR, "out of memory, %s:%d", __FILE__, __LINE__);
exit(1);
}
rrset->zone = zone;
rrset->rrs = 0;
rrset->rr_count = 0;
domain_add_rrset(domain, rrset);
#ifdef NSEC3
rrset_added = 1;
#endif
}
/* dnames in rdata are normalized, conform RFC 4035,
* Section 6.2
*/
rdata_num = rdata_wireformat_to_rdata_atoms(
db->region, db->domains, type, rdatalen, packet, &rdatas);
if(rdata_num == -1) {
log_msg(LOG_ERR, "diff: bad rdata for %s",
dname_to_string(dname,0));
return 0;
}
rrnum = find_rr_num(rrset, type, klass, rdatas, rdata_num, 1);
if(rrnum != -1) {
DEBUG(DEBUG_XFRD, 2, (LOG_ERR, "diff: RR <%s, %s> already exists",
dname_to_string(dname,0), rrtype_to_string(type)));
/* ignore already existing RR: lenient accepting of messages */
*softfail = 1;
return 1;
}
if(rrset->rr_count == 65535) {
log_msg(LOG_ERR, "diff: too many RRs at %s",
dname_to_string(dname,0));
return 0;
}
/* re-alloc the rrs and add the new */
rrs_old = rrset->rrs;
rrset->rrs = region_alloc_array(db->region,
(rrset->rr_count+1), sizeof(rr_type));
if(!rrset->rrs) {
log_msg(LOG_ERR, "out of memory, %s:%d", __FILE__, __LINE__);
exit(1);
}
if(rrs_old)
memcpy(rrset->rrs, rrs_old, rrset->rr_count * sizeof(rr_type));
region_recycle(db->region, rrs_old, sizeof(rr_type) * rrset->rr_count);
rrset->rr_count ++;
rrset->rrs[rrset->rr_count - 1].owner = domain;
rrset->rrs[rrset->rr_count - 1].rdatas = rdatas;
rrset->rrs[rrset->rr_count - 1].ttl = ttl;
rrset->rrs[rrset->rr_count - 1].type = type;
rrset->rrs[rrset->rr_count - 1].klass = klass;
rrset->rrs[rrset->rr_count - 1].rdata_count = rdata_num;
/* see if it is a SOA */
if(domain == zone->apex) {
apex_rrset_checks(db, rrset, domain);
#ifdef NSEC3
if(type == TYPE_NSEC3PARAM && zone->nsec3_param) {
/* the pointer just changed, fix it up to point
* to the same record */
assert(zone->nsec3_param >= rrs_old &&
zone->nsec3_param < rrs_old+rrset->rr_count);
/* in this order to make sure no overflow/underflow*/
zone->nsec3_param = (void*)zone->nsec3_param -
(void*)rrs_old + (void*)rrset->rrs;
}
#endif /* NSEC3 */
}
#ifdef NSEC3
if(rrset_added) {
domain_type* p = domain->parent;
nsec3_add_rrset_trigger(db, domain, zone, type);
/* go up and process (possibly created) empty nonterminals,
* until we hit the apex or root */
while(p && p->rrsets == NULL && !p->is_apex) {
nsec3_rrsets_changed_add_prehash(db, p, zone);
p = p->parent;
}
}
nsec3_add_rr_trigger(db, &rrset->rrs[rrset->rr_count - 1], zone);
#endif /* NSEC3 */
return 1;
}
static zone_type*
find_or_create_zone(namedb_type* db, const dname_type* zone_name,
struct nsd_options* opt, const char* zstr, const char* patname)
{
zone_type* zone;
struct zone_options* zopt;
zone = namedb_find_zone(db, zone_name);
if(zone) {
return zone;
}
zopt = zone_options_find(opt, zone_name);
if(!zopt) {
/* if _implicit_ then insert as _part_of_config */
if(strncmp(patname, PATTERN_IMPLICIT_MARKER,
strlen(PATTERN_IMPLICIT_MARKER)) == 0) {
zopt = zone_options_create(opt->region);
if(!zopt) return 0;
zopt->part_of_config = 1;
zopt->name = region_strdup(opt->region, zstr);
zopt->pattern = pattern_options_find(opt, patname);
if(!zopt->name || !zopt->pattern) return 0;
if(!nsd_options_insert_zone(opt, zopt)) {
log_msg(LOG_ERR, "bad domain name or duplicate zone '%s' "
"pattern %s", zstr, patname);
}
} else {
/* create zone : presumably already added to zonelist
* by xfrd, who wrote the AXFR or IXFR to disk, so we only
* need to add it to our config.
* This process does not need linesize and offset zonelist */
zopt = zone_list_zone_insert(opt, zstr, patname);
if(!zopt)
return 0;
}
}
zone = namedb_zone_create(db, zone_name, zopt);
return zone;
}
void
delete_zone_rrs(namedb_type* db, zone_type* zone)
{
rrset_type *rrset;
domain_type *domain = zone->apex, *next;
int nonexist_check = 0;
/* go through entire tree below the zone apex (incl subzones) */
while(domain && domain_is_subdomain(domain, zone->apex))
{
DEBUG(DEBUG_XFRD,2, (LOG_INFO, "delete zone visit %s",
domain_to_string(domain)));
/* delete all rrsets of the zone */
while((rrset = domain_find_any_rrset(domain, zone))) {
/* lower usage can delete other domains */
rrset_lower_usage(db, rrset);
/* rrset del does not delete our domain(yet) */
rrset_delete(db, domain, rrset);
/* no rrset_zero_nonexist_check, do that later */
if(domain->rrsets == 0)
nonexist_check = 1;
}
/* the delete upcoming could delete parents, but nothing next
* or after the domain so store next ptr */
next = domain_next(domain);
/* see if the domain can be deleted (and inspect parents) */
domain_table_deldomain(db, domain);
domain = next;
}
/* check if data deletions have created nonexisting domain entries,
* but after deleting domains so the checks are faster */
if(nonexist_check) {
domain_type* ce = NULL; /* for speeding up has_data_below */
DEBUG(DEBUG_XFRD, 1, (LOG_INFO, "axfrdel: zero rrset check"));
domain = zone->apex;
while(domain && domain_is_subdomain(domain, zone->apex))
{
/* the interesting domains should be existing==1
* and rrsets==0, speeding up out processing of
* sub-zones, since we only spuriously check empty
* nonterminals */
if(domain->is_existing)
ce = rrset_zero_nonexist_check(domain, ce);
domain = domain_next(domain);
}
}
DEBUG(DEBUG_XFRD, 1, (LOG_INFO, "axfrdel: recyclebin holds %lu bytes",
(unsigned long) region_get_recycle_size(db->region)));
#ifndef NDEBUG
if(nsd_debug_level >= 2)
region_log_stats(db->region);
#endif
assert(zone->soa_rrset == 0);
/* keep zone->soa_nx_rrset alloced: it is reused */
assert(zone->ns_rrset == 0);
assert(zone->is_secure == 0);
}
/* return value 0: syntaxerror,badIXFR, 1:OK, 2:done_and_skip_it */
static int
apply_ixfr(nsd_type* nsd, FILE *in, uint32_t serialno,
uint32_t seq_nr, uint32_t seq_total,
int* is_axfr, int* delete_mode, int* rr_count,
struct zone* zone, int* bytes,
int* softfail, struct ixfr_store* ixfr_store)
{
uint32_t msglen, checklen, pkttype;