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/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <inttypes.h>
#include "knot/dnssec/zone-nsec.h"
#include "knot/zone/zone-dump.h"
#include "libknot/libknot.h"
/*! \brief Size of auxiliary buffer. */
#define DUMP_BUF_LEN (70 * 1024)
/*! \brief Dump parameters. */
typedef struct {
FILE *file;
char *buf;
size_t buflen;
uint64_t rr_count;
bool dump_rrsig;
bool dump_nsec;
const knot_dname_t *origin;
const knot_dump_style_t *style;
const char *first_comment;
} dump_params_t;
static int apex_node_dump_text(zone_node_t *node, dump_params_t *params)
{
knot_rrset_t soa = node_rrset(node, KNOT_RRTYPE_SOA);
// Dump SOA record as a first.
if (!params->dump_nsec) {
int ret = knot_rrset_txt_dump(&soa, ¶ms->buf, ¶ms->buflen,
params->style);
if (ret < 0) {
return ret;
}
params->rr_count += soa.rrs.count;
fprintf(params->file, "%s", params->buf);
params->buf[0] = '\0';
}
// Dump other records.
for (uint16_t i = 0; i < node->rrset_count; i++) {
knot_rrset_t rrset = node_rrset_at(node, i);
switch (rrset.type) {
case KNOT_RRTYPE_NSEC:
continue;
case KNOT_RRTYPE_RRSIG:
continue;
case KNOT_RRTYPE_SOA:
continue;
default:
break;
}
int ret = knot_rrset_txt_dump(&rrset, ¶ms->buf, ¶ms->buflen,
params->style);
if (ret < 0) {
return ret;
}
params->rr_count += rrset.rrs.count;
fprintf(params->file, "%s", params->buf);
params->buf[0] = '\0';
}
return KNOT_EOK;
}
static int node_dump_text(zone_node_t *node, void *data)
{
dump_params_t *params = (dump_params_t *)data;
// Zone apex rrsets.
if (node->owner == params->origin && !params->dump_rrsig &&
!params->dump_nsec) {
apex_node_dump_text(node, params);
return KNOT_EOK;
}
// Dump non-apex rrsets.
for (uint16_t i = 0; i < node->rrset_count; i++) {
knot_rrset_t rrset = node_rrset_at(node, i);
switch (rrset.type) {
case KNOT_RRTYPE_RRSIG:
if (params->dump_rrsig) {
break;
}
continue;
case KNOT_RRTYPE_NSEC:
if (params->dump_nsec) {
break;
}
continue;
case KNOT_RRTYPE_NSEC3:
if (params->dump_nsec) {
break;
}
continue;
default:
if (params->dump_nsec || params->dump_rrsig) {
continue;
}
break;
}
// Dump block comment if available.
if (params->first_comment != NULL) {
fprintf(params->file, "%s", params->first_comment);
params->first_comment = NULL;
}
int ret = knot_rrset_txt_dump(&rrset, ¶ms->buf, ¶ms->buflen,
params->style);
if (ret < 0) {
return ret;
}
params->rr_count += rrset.rrs.count;
fprintf(params->file, "%s", params->buf);
params->buf[0] = '\0';
}
return KNOT_EOK;
}
int zone_dump_text(zone_contents_t *zone, FILE *file, bool comments, const char *color)
{
if (file == NULL) {
return KNOT_EINVAL;
}
if (zone == NULL) {
return KNOT_EEMPTYZONE;
}
// Allocate auxiliary buffer for dumping operations.
char *buf = malloc(DUMP_BUF_LEN);
if (buf == NULL) {
return KNOT_ENOMEM;
}
if (comments) {
fprintf(file, ";; Zone dump (Knot DNS %s)\n", PACKAGE_VERSION);
}
// Set structure with parameters.
knot_dump_style_t style = KNOT_DUMP_STYLE_DEFAULT;
style.color = color;
style.now = knot_time();
dump_params_t params = {
.file = file,
.buf = buf,
.buflen = DUMP_BUF_LEN,
.rr_count = 0,
.origin = zone->apex->owner,
.style = &style,
.dump_rrsig = false,
.dump_nsec = false
};
// Dump standard zone records without RRSIGS.
int ret = zone_contents_apply(zone, node_dump_text, ¶ms);
if (ret != KNOT_EOK) {
free(params.buf);
return ret;
}
// Dump RRSIG records if available.
params.dump_rrsig = true;
params.dump_nsec = false;
params.first_comment = comments ? ";; DNSSEC signatures\n" : NULL;
ret = zone_contents_apply(zone, node_dump_text, ¶ms);
if (ret != KNOT_EOK) {
free(params.buf);
return ret;
}
// Dump NSEC chain if available.
params.dump_rrsig = false;
params.dump_nsec = true;
params.first_comment = comments ? ";; DNSSEC NSEC chain\n" : NULL;
ret = zone_contents_apply(zone, node_dump_text, ¶ms);
if (ret != KNOT_EOK) {
free(params.buf);
return ret;
}
// Dump NSEC3 chain if available.
params.dump_rrsig = false;
params.dump_nsec = true;
params.first_comment = comments ? ";; DNSSEC NSEC3 chain\n" : NULL;
ret = zone_contents_nsec3_apply(zone, node_dump_text, ¶ms);
if (ret != KNOT_EOK) {
free(params.buf);
return ret;
}
params.dump_rrsig = true;
params.dump_nsec = false;
params.first_comment = comments ? ";; DNSSEC NSEC3 signatures\n" : NULL;
ret = zone_contents_nsec3_apply(zone, node_dump_text, ¶ms);
if (ret != KNOT_EOK) {
free(params.buf);
return ret;
}
if (comments) {
// Create formatted date-time string.
time_t now = time(NULL);
struct tm tm;
localtime_r(&now, &tm);
char date[64];
strftime(date, sizeof(date), "%Y-%m-%d %H:%M:%S %Z", &tm);
// Dump trailing statistics.
fprintf(file, ";; Written %"PRIu64" records\n"
";; Time %s\n",
params.rr_count, date);
}
free(params.buf); // params.buf may be != buf because of knot_rrset_txt_dump_dynamic()
return KNOT_EOK;
}
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