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-rw-r--r--lib/dns/masterdump.c2094
1 files changed, 2094 insertions, 0 deletions
diff --git a/lib/dns/masterdump.c b/lib/dns/masterdump.c
new file mode 100644
index 0000000..4946d0d
--- /dev/null
+++ b/lib/dns/masterdump.c
@@ -0,0 +1,2094 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include <isc/atomic.h>
+#include <isc/buffer.h>
+#include <isc/event.h>
+#include <isc/file.h>
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/refcount.h>
+#include <isc/result.h>
+#include <isc/stdio.h>
+#include <isc/string.h>
+#include <isc/task.h>
+#include <isc/time.h>
+#include <isc/types.h>
+#include <isc/util.h>
+
+#include <dns/db.h>
+#include <dns/dbiterator.h>
+#include <dns/events.h>
+#include <dns/fixedname.h>
+#include <dns/log.h>
+#include <dns/master.h>
+#include <dns/masterdump.h>
+#include <dns/ncache.h>
+#include <dns/rdata.h>
+#include <dns/rdataclass.h>
+#include <dns/rdataset.h>
+#include <dns/rdatasetiter.h>
+#include <dns/rdatatype.h>
+#include <dns/time.h>
+#include <dns/ttl.h>
+
+#define DNS_DCTX_MAGIC ISC_MAGIC('D', 'c', 't', 'x')
+#define DNS_DCTX_VALID(d) ISC_MAGIC_VALID(d, DNS_DCTX_MAGIC)
+
+#define RETERR(x) \
+ do { \
+ isc_result_t _r = (x); \
+ if (_r != ISC_R_SUCCESS) \
+ return ((_r)); \
+ } while (0)
+
+#define CHECK(x) \
+ do { \
+ if ((x) != ISC_R_SUCCESS) \
+ goto cleanup; \
+ } while (0)
+
+struct dns_master_style {
+ dns_masterstyle_flags_t flags; /* DNS_STYLEFLAG_* */
+ unsigned int ttl_column;
+ unsigned int class_column;
+ unsigned int type_column;
+ unsigned int rdata_column;
+ unsigned int line_length;
+ unsigned int tab_width;
+ unsigned int split_width;
+};
+
+/*%
+ * The maximum length of the newline+indentation that is output
+ * when inserting a line break in an RR. This effectively puts an
+ * upper limits on the value of "rdata_column", because if it is
+ * very large, the tabs and spaces needed to reach it will not fit.
+ */
+#define DNS_TOTEXT_LINEBREAK_MAXLEN 100
+
+/*% Does the rdataset 'r' contain a stale answer? */
+#define STALE(r) (((r)->attributes & DNS_RDATASETATTR_STALE) != 0)
+/*% Does the rdataset 'r' contain an expired answer? */
+#define ANCIENT(r) (((r)->attributes & DNS_RDATASETATTR_ANCIENT) != 0)
+
+/*%
+ * Context structure for a masterfile dump in progress.
+ */
+typedef struct dns_totext_ctx {
+ dns_master_style_t style;
+ bool class_printed;
+ char *linebreak;
+ char linebreak_buf[DNS_TOTEXT_LINEBREAK_MAXLEN];
+ dns_name_t *origin;
+ dns_name_t *neworigin;
+ dns_fixedname_t origin_fixname;
+ uint32_t current_ttl;
+ bool current_ttl_valid;
+ dns_ttl_t serve_stale_ttl;
+ dns_indent_t indent;
+} dns_totext_ctx_t;
+
+const dns_master_style_t dns_master_style_keyzone = {
+ DNS_STYLEFLAG_OMIT_OWNER | DNS_STYLEFLAG_OMIT_CLASS |
+ DNS_STYLEFLAG_REL_OWNER | DNS_STYLEFLAG_REL_DATA |
+ DNS_STYLEFLAG_OMIT_TTL | DNS_STYLEFLAG_TTL |
+ DNS_STYLEFLAG_COMMENT | DNS_STYLEFLAG_RRCOMMENT |
+ DNS_STYLEFLAG_MULTILINE | DNS_STYLEFLAG_KEYDATA,
+ 24,
+ 24,
+ 24,
+ 32,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+const dns_master_style_t dns_master_style_default = {
+ DNS_STYLEFLAG_OMIT_OWNER | DNS_STYLEFLAG_OMIT_CLASS |
+ DNS_STYLEFLAG_REL_OWNER | DNS_STYLEFLAG_REL_DATA |
+ DNS_STYLEFLAG_OMIT_TTL | DNS_STYLEFLAG_TTL |
+ DNS_STYLEFLAG_COMMENT | DNS_STYLEFLAG_RRCOMMENT |
+ DNS_STYLEFLAG_MULTILINE,
+ 24,
+ 24,
+ 24,
+ 32,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+const dns_master_style_t dns_master_style_full = {
+ DNS_STYLEFLAG_COMMENT | DNS_STYLEFLAG_RESIGN,
+ 46,
+ 46,
+ 46,
+ 64,
+ 120,
+ 8,
+ UINT_MAX
+};
+
+const dns_master_style_t dns_master_style_explicitttl = {
+ DNS_STYLEFLAG_OMIT_OWNER | DNS_STYLEFLAG_OMIT_CLASS |
+ DNS_STYLEFLAG_REL_OWNER | DNS_STYLEFLAG_REL_DATA |
+ DNS_STYLEFLAG_COMMENT | DNS_STYLEFLAG_RRCOMMENT |
+ DNS_STYLEFLAG_MULTILINE,
+ 24,
+ 32,
+ 32,
+ 40,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+const dns_master_style_t dns_master_style_cache = {
+ DNS_STYLEFLAG_OMIT_OWNER | DNS_STYLEFLAG_OMIT_CLASS |
+ DNS_STYLEFLAG_MULTILINE | DNS_STYLEFLAG_RRCOMMENT |
+ DNS_STYLEFLAG_TRUST | DNS_STYLEFLAG_NCACHE,
+ 24,
+ 32,
+ 32,
+ 40,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+const dns_master_style_t dns_master_style_cache_with_expired = {
+ DNS_STYLEFLAG_OMIT_OWNER | DNS_STYLEFLAG_OMIT_CLASS |
+ DNS_STYLEFLAG_MULTILINE | DNS_STYLEFLAG_RRCOMMENT |
+ DNS_STYLEFLAG_TRUST | DNS_STYLEFLAG_NCACHE |
+ DNS_STYLEFLAG_EXPIRED,
+ 24,
+ 32,
+ 32,
+ 40,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+const dns_master_style_t dns_master_style_simple = { 0, 24, 32, 32,
+ 40, 80, 8, UINT_MAX };
+
+/*%
+ * A style suitable for dns_rdataset_totext().
+ */
+const dns_master_style_t dns_master_style_debug = {
+ DNS_STYLEFLAG_REL_OWNER, 24, 32, 40, 48, 80, 8, UINT_MAX
+};
+
+/*%
+ * Similar, but indented (i.e., prepended with indentctx.string).
+ */
+const dns_master_style_t dns_master_style_indent = {
+ DNS_STYLEFLAG_REL_OWNER | DNS_STYLEFLAG_INDENT,
+ 24,
+ 32,
+ 40,
+ 48,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+/*%
+ * Similar, but with each line commented out.
+ */
+const dns_master_style_t dns_master_style_comment = {
+ DNS_STYLEFLAG_REL_OWNER | DNS_STYLEFLAG_MULTILINE |
+ DNS_STYLEFLAG_RRCOMMENT | DNS_STYLEFLAG_COMMENTDATA,
+ 24,
+ 32,
+ 40,
+ 48,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+/*%
+ * YAML style
+ */
+const dns_master_style_t dns_master_style_yaml = {
+ DNS_STYLEFLAG_YAML | DNS_STYLEFLAG_REL_OWNER | DNS_STYLEFLAG_INDENT,
+ 24,
+ 32,
+ 40,
+ 48,
+ 80,
+ 8,
+ UINT_MAX
+};
+
+#define N_SPACES 10
+static char spaces[N_SPACES + 1] = " ";
+
+#define N_TABS 10
+static char tabs[N_TABS + 1] = "\t\t\t\t\t\t\t\t\t\t";
+
+struct dns_dumpctx {
+ unsigned int magic;
+ isc_mem_t *mctx;
+ isc_mutex_t lock;
+ isc_refcount_t references;
+ atomic_bool canceled;
+ bool do_date;
+ isc_stdtime_t now;
+ FILE *f;
+ dns_db_t *db;
+ dns_dbversion_t *version;
+ dns_dbiterator_t *dbiter;
+ dns_totext_ctx_t tctx;
+ isc_task_t *task;
+ dns_dumpdonefunc_t done;
+ void *done_arg;
+ /* dns_master_dumpasync() */
+ isc_result_t result;
+ char *file;
+ char *tmpfile;
+ dns_masterformat_t format;
+ dns_masterrawheader_t header;
+ isc_result_t (*dumpsets)(isc_mem_t *mctx, const dns_name_t *name,
+ dns_rdatasetiter_t *rdsiter,
+ dns_totext_ctx_t *ctx, isc_buffer_t *buffer,
+ FILE *f);
+};
+
+#define NXDOMAIN(x) (((x)->attributes & DNS_RDATASETATTR_NXDOMAIN) != 0)
+
+static const dns_indent_t default_indent = { "\t", 1 };
+static const dns_indent_t default_yamlindent = { " ", 1 };
+
+/*%
+ * Output tabs and spaces to go from column '*current' to
+ * column 'to', and update '*current' to reflect the new
+ * current column.
+ */
+static isc_result_t
+indent(unsigned int *current, unsigned int to, int tabwidth,
+ isc_buffer_t *target) {
+ isc_region_t r;
+ unsigned char *p;
+ unsigned int from;
+ int ntabs, nspaces, t;
+
+ from = *current;
+
+ if (to < from + 1) {
+ to = from + 1;
+ }
+
+ ntabs = to / tabwidth - from / tabwidth;
+ if (ntabs < 0) {
+ ntabs = 0;
+ }
+
+ if (ntabs > 0) {
+ isc_buffer_availableregion(target, &r);
+ if (r.length < (unsigned)ntabs) {
+ return (ISC_R_NOSPACE);
+ }
+ p = r.base;
+
+ t = ntabs;
+ while (t) {
+ int n = t;
+ if (n > N_TABS) {
+ n = N_TABS;
+ }
+ memmove(p, tabs, n);
+ p += n;
+ t -= n;
+ }
+ isc_buffer_add(target, ntabs);
+ from = (to / tabwidth) * tabwidth;
+ }
+
+ nspaces = to - from;
+ INSIST(nspaces >= 0);
+
+ isc_buffer_availableregion(target, &r);
+ if (r.length < (unsigned)nspaces) {
+ return (ISC_R_NOSPACE);
+ }
+ p = r.base;
+
+ t = nspaces;
+ while (t) {
+ int n = t;
+ if (n > N_SPACES) {
+ n = N_SPACES;
+ }
+ memmove(p, spaces, n);
+ p += n;
+ t -= n;
+ }
+ isc_buffer_add(target, nspaces);
+
+ *current = to;
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+totext_ctx_init(const dns_master_style_t *style, const dns_indent_t *indentctx,
+ dns_totext_ctx_t *ctx) {
+ isc_result_t result;
+
+ REQUIRE(style->tab_width != 0);
+
+ if (indentctx == NULL) {
+ if ((style->flags & DNS_STYLEFLAG_YAML) != 0) {
+ indentctx = &default_yamlindent;
+ } else {
+ indentctx = &default_indent;
+ }
+ }
+
+ ctx->style = *style;
+ ctx->class_printed = false;
+
+ dns_fixedname_init(&ctx->origin_fixname);
+
+ /*
+ * Set up the line break string if needed.
+ */
+ if ((ctx->style.flags & DNS_STYLEFLAG_MULTILINE) != 0) {
+ isc_buffer_t buf;
+ isc_region_t r;
+ unsigned int col = 0;
+
+ isc_buffer_init(&buf, ctx->linebreak_buf,
+ sizeof(ctx->linebreak_buf));
+
+ isc_buffer_availableregion(&buf, &r);
+ if (r.length < 1) {
+ return (DNS_R_TEXTTOOLONG);
+ }
+ r.base[0] = '\n';
+ isc_buffer_add(&buf, 1);
+
+ if ((ctx->style.flags & DNS_STYLEFLAG_INDENT) != 0 ||
+ (ctx->style.flags & DNS_STYLEFLAG_YAML) != 0)
+ {
+ unsigned int i, len = strlen(indentctx->string);
+ for (i = 0; i < indentctx->count; i++) {
+ if (isc_buffer_availablelength(&buf) < len) {
+ return (DNS_R_TEXTTOOLONG);
+ }
+ isc_buffer_putstr(&buf, indentctx->string);
+ }
+ }
+
+ if ((ctx->style.flags & DNS_STYLEFLAG_COMMENTDATA) != 0) {
+ isc_buffer_availableregion(&buf, &r);
+ if (r.length < 1) {
+ return (DNS_R_TEXTTOOLONG);
+ }
+ r.base[0] = ';';
+ isc_buffer_add(&buf, 1);
+ }
+
+ result = indent(&col, ctx->style.rdata_column,
+ ctx->style.tab_width, &buf);
+ /*
+ * Do not return ISC_R_NOSPACE if the line break string
+ * buffer is too small, because that would just make
+ * dump_rdataset() retry indefinitely with ever
+ * bigger target buffers. That's a different buffer,
+ * so it won't help. Use DNS_R_TEXTTOOLONG as a substitute.
+ */
+ if (result == ISC_R_NOSPACE) {
+ return (DNS_R_TEXTTOOLONG);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ isc_buffer_availableregion(&buf, &r);
+ if (r.length < 1) {
+ return (DNS_R_TEXTTOOLONG);
+ }
+ r.base[0] = '\0';
+ isc_buffer_add(&buf, 1);
+ ctx->linebreak = ctx->linebreak_buf;
+ } else {
+ ctx->linebreak = NULL;
+ }
+
+ ctx->origin = NULL;
+ ctx->neworigin = NULL;
+ ctx->current_ttl = 0;
+ ctx->current_ttl_valid = false;
+ ctx->serve_stale_ttl = 0;
+ ctx->indent = *indentctx;
+
+ return (ISC_R_SUCCESS);
+}
+
+#define INDENT_TO(col) \
+ do { \
+ if ((ctx->style.flags & DNS_STYLEFLAG_YAML) != 0) { \
+ if ((result = str_totext(" ", target)) != \
+ ISC_R_SUCCESS) \
+ return ((result)); \
+ } else if ((result = indent(&column, ctx->style.col, \
+ ctx->style.tab_width, target)) != \
+ ISC_R_SUCCESS) \
+ return ((result)); \
+ } while (0)
+
+static isc_result_t
+str_totext(const char *source, isc_buffer_t *target) {
+ unsigned int l;
+ isc_region_t region;
+
+ isc_buffer_availableregion(target, &region);
+ l = strlen(source);
+
+ if (l > region.length) {
+ return (ISC_R_NOSPACE);
+ }
+
+ memmove(region.base, source, l);
+ isc_buffer_add(target, l);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+ncache_summary(dns_rdataset_t *rdataset, bool omit_final_dot,
+ dns_totext_ctx_t *ctx, isc_buffer_t *target) {
+ isc_result_t result = ISC_R_SUCCESS;
+ dns_rdataset_t rds;
+ dns_name_t name;
+
+ dns_rdataset_init(&rds);
+ dns_name_init(&name, NULL);
+
+ do {
+ dns_ncache_current(rdataset, &name, &rds);
+ for (result = dns_rdataset_first(&rds); result == ISC_R_SUCCESS;
+ result = dns_rdataset_next(&rds))
+ {
+ if ((ctx->style.flags & DNS_STYLEFLAG_INDENT) != 0 ||
+ (ctx->style.flags & DNS_STYLEFLAG_YAML) != 0)
+ {
+ unsigned int i;
+ for (i = 0; i < ctx->indent.count; i++) {
+ CHECK(str_totext(ctx->indent.string,
+ target));
+ }
+ }
+
+ if ((ctx->style.flags & DNS_STYLEFLAG_YAML) != 0) {
+ CHECK(str_totext("- ", target));
+ } else {
+ CHECK(str_totext("; ", target));
+ }
+
+ CHECK(dns_name_totext(&name, omit_final_dot, target));
+ CHECK(str_totext(" ", target));
+ CHECK(dns_rdatatype_totext(rds.type, target));
+ if (rds.type == dns_rdatatype_rrsig) {
+ CHECK(str_totext(" ", target));
+ CHECK(dns_rdatatype_totext(rds.covers, target));
+ CHECK(str_totext(" ...\n", target));
+ } else {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ dns_rdataset_current(&rds, &rdata);
+ CHECK(str_totext(" ", target));
+ CHECK(dns_rdata_tofmttext(&rdata, dns_rootname,
+ 0, 0, 0, " ",
+ target));
+ CHECK(str_totext("\n", target));
+ }
+ }
+ dns_rdataset_disassociate(&rds);
+ result = dns_rdataset_next(rdataset);
+ } while (result == ISC_R_SUCCESS);
+
+ if (result == ISC_R_NOMORE) {
+ result = ISC_R_SUCCESS;
+ }
+cleanup:
+ if (dns_rdataset_isassociated(&rds)) {
+ dns_rdataset_disassociate(&rds);
+ }
+
+ return (result);
+}
+
+/*
+ * Convert 'rdataset' to master file text format according to 'ctx',
+ * storing the result in 'target'. If 'owner_name' is NULL, it
+ * is omitted; otherwise 'owner_name' must be valid and have at least
+ * one label.
+ */
+
+static isc_result_t
+rdataset_totext(dns_rdataset_t *rdataset, const dns_name_t *owner_name,
+ dns_totext_ctx_t *ctx, bool omit_final_dot,
+ isc_buffer_t *target) {
+ isc_result_t result;
+ unsigned int column;
+ bool first = true;
+ uint32_t current_ttl;
+ bool current_ttl_valid;
+ dns_rdatatype_t type;
+ unsigned int type_start;
+ dns_fixedname_t fixed;
+ dns_name_t *name = NULL;
+ unsigned int i;
+
+ REQUIRE(DNS_RDATASET_VALID(rdataset));
+
+ rdataset->attributes |= DNS_RDATASETATTR_LOADORDER;
+ result = dns_rdataset_first(rdataset);
+
+ current_ttl = ctx->current_ttl;
+ current_ttl_valid = ctx->current_ttl_valid;
+
+ if (owner_name != NULL) {
+ name = dns_fixedname_initname(&fixed);
+ dns_name_copy(owner_name, name);
+ dns_rdataset_getownercase(rdataset, name);
+ }
+
+ while (result == ISC_R_SUCCESS) {
+ column = 0;
+
+ /*
+ * Indent?
+ */
+ if ((ctx->style.flags & DNS_STYLEFLAG_INDENT) != 0 ||
+ (ctx->style.flags & DNS_STYLEFLAG_YAML) != 0)
+ {
+ for (i = 0; i < ctx->indent.count; i++) {
+ RETERR(str_totext(ctx->indent.string, target));
+ }
+ }
+
+ /*
+ * YAML or comment prefix?
+ */
+ if ((ctx->style.flags & DNS_STYLEFLAG_YAML) != 0) {
+ RETERR(str_totext("- ", target));
+ } else if ((ctx->style.flags & DNS_STYLEFLAG_COMMENTDATA) != 0)
+ {
+ RETERR(str_totext(";", target));
+ }
+
+ /*
+ * Owner name.
+ */
+ if (name != NULL &&
+ !((ctx->style.flags & DNS_STYLEFLAG_OMIT_OWNER) != 0 &&
+ !first))
+ {
+ unsigned int name_start = target->used;
+ RETERR(dns_name_totext(name, omit_final_dot, target));
+ column += target->used - name_start;
+ }
+
+ /*
+ * TTL.
+ */
+ if ((ctx->style.flags & DNS_STYLEFLAG_NO_TTL) == 0 &&
+ !((ctx->style.flags & DNS_STYLEFLAG_OMIT_TTL) != 0 &&
+ current_ttl_valid && rdataset->ttl == current_ttl))
+ {
+ char ttlbuf[64];
+ isc_region_t r;
+ unsigned int length;
+
+ INDENT_TO(ttl_column);
+ if ((ctx->style.flags & DNS_STYLEFLAG_TTL_UNITS) != 0) {
+ length = target->used;
+ result = dns_ttl_totext(rdataset->ttl, false,
+ false, target);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ column += target->used - length;
+ } else {
+ length = snprintf(ttlbuf, sizeof(ttlbuf), "%u",
+ rdataset->ttl);
+ INSIST(length <= sizeof(ttlbuf));
+ isc_buffer_availableregion(target, &r);
+ if (r.length < length) {
+ return (ISC_R_NOSPACE);
+ }
+ memmove(r.base, ttlbuf, length);
+ isc_buffer_add(target, length);
+ column += length;
+ }
+
+ /*
+ * If the $TTL directive is not in use, the TTL we
+ * just printed becomes the default for subsequent RRs.
+ */
+ if ((ctx->style.flags & DNS_STYLEFLAG_TTL) == 0) {
+ current_ttl = rdataset->ttl;
+ current_ttl_valid = true;
+ }
+ }
+
+ /*
+ * Class.
+ */
+ if ((ctx->style.flags & DNS_STYLEFLAG_NO_CLASS) == 0 &&
+ ((ctx->style.flags & DNS_STYLEFLAG_OMIT_CLASS) == 0 ||
+ !ctx->class_printed))
+ {
+ unsigned int class_start;
+ INDENT_TO(class_column);
+ class_start = target->used;
+ if ((ctx->style.flags & DNS_STYLEFLAG_UNKNOWNFORMAT) !=
+ 0)
+ {
+ result = dns_rdataclass_tounknowntext(
+ rdataset->rdclass, target);
+ } else {
+ result = dns_rdataclass_totext(
+ rdataset->rdclass, target);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ column += (target->used - class_start);
+ }
+
+ /*
+ * Type.
+ */
+
+ if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
+ type = rdataset->covers;
+ } else {
+ type = rdataset->type;
+ }
+
+ INDENT_TO(type_column);
+ type_start = target->used;
+ if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
+ RETERR(str_totext("\\-", target));
+ }
+ switch (type) {
+ case dns_rdatatype_keydata:
+#define KEYDATA "KEYDATA"
+ if ((ctx->style.flags & DNS_STYLEFLAG_KEYDATA) != 0) {
+ if (isc_buffer_availablelength(target) <
+ (sizeof(KEYDATA) - 1))
+ {
+ return (ISC_R_NOSPACE);
+ }
+ isc_buffer_putstr(target, KEYDATA);
+ break;
+ }
+ FALLTHROUGH;
+ default:
+ if ((ctx->style.flags & DNS_STYLEFLAG_UNKNOWNFORMAT) !=
+ 0)
+ {
+ result = dns_rdatatype_tounknowntext(type,
+ target);
+ } else {
+ result = dns_rdatatype_totext(type, target);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+ column += (target->used - type_start);
+
+ /*
+ * Rdata.
+ */
+ INDENT_TO(rdata_column);
+ if ((rdataset->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) {
+ if (NXDOMAIN(rdataset)) {
+ RETERR(str_totext(";-$NXDOMAIN\n", target));
+ } else {
+ RETERR(str_totext(";-$NXRRSET\n", target));
+ }
+ /*
+ * Print a summary of the cached records which make
+ * up the negative response.
+ */
+ RETERR(ncache_summary(rdataset, omit_final_dot, ctx,
+ target));
+ break;
+ } else {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+ isc_region_t r;
+
+ dns_rdataset_current(rdataset, &rdata);
+
+ RETERR(dns_rdata_tofmttext(
+ &rdata, ctx->origin, ctx->style.flags,
+ ctx->style.line_length -
+ ctx->style.rdata_column,
+ ctx->style.split_width, ctx->linebreak,
+ target));
+
+ isc_buffer_availableregion(target, &r);
+ if (r.length < 1) {
+ return (ISC_R_NOSPACE);
+ }
+ r.base[0] = '\n';
+ isc_buffer_add(target, 1);
+ }
+
+ first = false;
+ result = dns_rdataset_next(rdataset);
+ }
+
+ if (result != ISC_R_NOMORE) {
+ return (result);
+ }
+
+ /*
+ * Update the ctx state to reflect what we just printed.
+ * This is done last, only when we are sure we will return
+ * success, because this function may be called multiple
+ * times with increasing buffer sizes until it succeeds,
+ * and failed attempts must not update the state prematurely.
+ */
+ ctx->class_printed = true;
+ ctx->current_ttl = current_ttl;
+ ctx->current_ttl_valid = current_ttl_valid;
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Print the name, type, and class of an empty rdataset,
+ * such as those used to represent the question section
+ * of a DNS message.
+ */
+static isc_result_t
+question_totext(dns_rdataset_t *rdataset, const dns_name_t *owner_name,
+ dns_totext_ctx_t *ctx, bool omit_final_dot,
+ isc_buffer_t *target) {
+ unsigned int column;
+ isc_result_t result;
+ isc_region_t r;
+
+ REQUIRE(DNS_RDATASET_VALID(rdataset));
+ result = dns_rdataset_first(rdataset);
+ REQUIRE(result == ISC_R_NOMORE);
+
+ column = 0;
+
+ /* Owner name */
+ {
+ unsigned int name_start = target->used;
+ RETERR(dns_name_totext(owner_name, omit_final_dot, target));
+ column += target->used - name_start;
+ }
+
+ /* Class */
+ {
+ unsigned int class_start;
+ INDENT_TO(class_column);
+ class_start = target->used;
+ if ((ctx->style.flags & DNS_STYLEFLAG_UNKNOWNFORMAT) != 0) {
+ result = dns_rdataclass_tounknowntext(rdataset->rdclass,
+ target);
+ } else {
+ result = dns_rdataclass_totext(rdataset->rdclass,
+ target);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ column += (target->used - class_start);
+ }
+
+ /* Type */
+ {
+ unsigned int type_start;
+ INDENT_TO(type_column);
+ type_start = target->used;
+ if ((ctx->style.flags & DNS_STYLEFLAG_UNKNOWNFORMAT) != 0) {
+ result = dns_rdatatype_tounknowntext(rdataset->type,
+ target);
+ } else {
+ result = dns_rdatatype_totext(rdataset->type, target);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ column += (target->used - type_start);
+ }
+
+ isc_buffer_availableregion(target, &r);
+ if (r.length < 1) {
+ return (ISC_R_NOSPACE);
+ }
+ r.base[0] = '\n';
+ isc_buffer_add(target, 1);
+
+ return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dns_rdataset_totext(dns_rdataset_t *rdataset, const dns_name_t *owner_name,
+ bool omit_final_dot, bool question, isc_buffer_t *target) {
+ dns_totext_ctx_t ctx;
+ isc_result_t result;
+ result = totext_ctx_init(&dns_master_style_debug, NULL, &ctx);
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR("could not set master file style");
+ return (ISC_R_UNEXPECTED);
+ }
+
+ /*
+ * The caller might want to give us an empty owner
+ * name (e.g. if they are outputting into a master
+ * file and this rdataset has the same name as the
+ * previous one.)
+ */
+ if (dns_name_countlabels(owner_name) == 0) {
+ owner_name = NULL;
+ }
+
+ if (question) {
+ return (question_totext(rdataset, owner_name, &ctx,
+ omit_final_dot, target));
+ } else {
+ return (rdataset_totext(rdataset, owner_name, &ctx,
+ omit_final_dot, target));
+ }
+}
+
+isc_result_t
+dns_master_rdatasettotext(const dns_name_t *owner_name,
+ dns_rdataset_t *rdataset,
+ const dns_master_style_t *style, dns_indent_t *indent,
+ isc_buffer_t *target) {
+ dns_totext_ctx_t ctx;
+ isc_result_t result;
+ result = totext_ctx_init(style, indent, &ctx);
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR("could not set master file style");
+ return (ISC_R_UNEXPECTED);
+ }
+
+ return (rdataset_totext(rdataset, owner_name, &ctx, false, target));
+}
+
+isc_result_t
+dns_master_questiontotext(const dns_name_t *owner_name,
+ dns_rdataset_t *rdataset,
+ const dns_master_style_t *style,
+ isc_buffer_t *target) {
+ dns_totext_ctx_t ctx;
+ isc_result_t result;
+ result = totext_ctx_init(style, NULL, &ctx);
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR("could not set master file style");
+ return (ISC_R_UNEXPECTED);
+ }
+
+ return (question_totext(rdataset, owner_name, &ctx, false, target));
+}
+
+/*
+ * Print an rdataset. 'buffer' is a scratch buffer, which must have been
+ * dynamically allocated by the caller. It must be large enough to
+ * hold the result from dns_ttl_totext(). If more than that is needed,
+ * the buffer will be grown automatically.
+ */
+
+static isc_result_t
+dump_rdataset(isc_mem_t *mctx, const dns_name_t *name, dns_rdataset_t *rdataset,
+ dns_totext_ctx_t *ctx, isc_buffer_t *buffer, FILE *f) {
+ isc_region_t r;
+ isc_result_t result;
+
+ REQUIRE(buffer->length > 0);
+
+ /*
+ * Output a $TTL directive if needed.
+ */
+
+ if ((ctx->style.flags & DNS_STYLEFLAG_TTL) != 0) {
+ if (!ctx->current_ttl_valid ||
+ ctx->current_ttl != rdataset->ttl)
+ {
+ if ((ctx->style.flags & DNS_STYLEFLAG_COMMENT) != 0) {
+ isc_buffer_clear(buffer);
+ result = dns_ttl_totext(rdataset->ttl, true,
+ true, buffer);
+ INSIST(result == ISC_R_SUCCESS);
+ isc_buffer_usedregion(buffer, &r);
+ fprintf(f, "$TTL %u\t; %.*s\n", rdataset->ttl,
+ (int)r.length, (char *)r.base);
+ } else {
+ fprintf(f, "$TTL %u\n", rdataset->ttl);
+ }
+ ctx->current_ttl = rdataset->ttl;
+ ctx->current_ttl_valid = true;
+ }
+ }
+
+ isc_buffer_clear(buffer);
+
+ /*
+ * Generate the text representation of the rdataset into
+ * the buffer. If the buffer is too small, grow it.
+ */
+ for (;;) {
+ int newlength;
+ void *newmem;
+ result = rdataset_totext(rdataset, name, ctx, false, buffer);
+ if (result != ISC_R_NOSPACE) {
+ break;
+ }
+
+ newlength = buffer->length * 2;
+ newmem = isc_mem_get(mctx, newlength);
+ isc_mem_put(mctx, buffer->base, buffer->length);
+ isc_buffer_init(buffer, newmem, newlength);
+ }
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ /*
+ * Write the buffer contents to the master file.
+ */
+ isc_buffer_usedregion(buffer, &r);
+ result = isc_stdio_write(r.base, 1, (size_t)r.length, f, NULL);
+
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR("master file write failed: %s",
+ isc_result_totext(result));
+ return (result);
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Define the order in which rdatasets should be printed in zone
+ * files. We will print SOA and NS records before others, SIGs
+ * immediately following the things they sign, and order everything
+ * else by RR number. This is all just for aesthetics and
+ * compatibility with buggy software that expects the SOA to be first;
+ * the DNS specifications allow any order.
+ */
+
+static int
+dump_order(const dns_rdataset_t *rds) {
+ int t;
+ int sig;
+ if (rds->type == dns_rdatatype_rrsig) {
+ t = rds->covers;
+ sig = 1;
+ } else {
+ t = rds->type;
+ sig = 0;
+ }
+ switch (t) {
+ case dns_rdatatype_soa:
+ t = 0;
+ break;
+ case dns_rdatatype_ns:
+ t = 1;
+ break;
+ default:
+ t += 2;
+ break;
+ }
+ return ((t << 1) + sig);
+}
+
+static int
+dump_order_compare(const void *a, const void *b) {
+ return (dump_order(*((const dns_rdataset_t *const *)a)) -
+ dump_order(*((const dns_rdataset_t *const *)b)));
+}
+
+/*
+ * Dump all the rdatasets of a domain name to a master file. We make
+ * a "best effort" attempt to sort the RRsets in a nice order, but if
+ * there are more than MAXSORT RRsets, we punt and only sort them in
+ * groups of MAXSORT. This is not expected to ever happen in practice
+ * since much less than 64 RR types have been registered with the
+ * IANA, so far, and the output will be correct (though not
+ * aesthetically pleasing) even if it does happen.
+ */
+
+#define MAXSORT 64
+
+static isc_result_t
+dump_rdatasets_text(isc_mem_t *mctx, const dns_name_t *name,
+ dns_rdatasetiter_t *rdsiter, dns_totext_ctx_t *ctx,
+ isc_buffer_t *buffer, FILE *f) {
+ isc_result_t itresult, dumpresult;
+ isc_region_t r;
+ dns_rdataset_t rdatasets[MAXSORT];
+ dns_rdataset_t *sorted[MAXSORT];
+ int i, n;
+
+ itresult = dns_rdatasetiter_first(rdsiter);
+ dumpresult = ISC_R_SUCCESS;
+
+ if (itresult == ISC_R_SUCCESS && ctx->neworigin != NULL) {
+ isc_buffer_clear(buffer);
+ itresult = dns_name_totext(ctx->neworigin, false, buffer);
+ RUNTIME_CHECK(itresult == ISC_R_SUCCESS);
+ isc_buffer_usedregion(buffer, &r);
+ fprintf(f, "$ORIGIN %.*s\n", (int)r.length, (char *)r.base);
+ ctx->neworigin = NULL;
+ }
+
+again:
+ for (i = 0; itresult == ISC_R_SUCCESS && i < MAXSORT;
+ itresult = dns_rdatasetiter_next(rdsiter), i++)
+ {
+ dns_rdataset_init(&rdatasets[i]);
+ dns_rdatasetiter_current(rdsiter, &rdatasets[i]);
+ sorted[i] = &rdatasets[i];
+ }
+ n = i;
+ INSIST(n <= MAXSORT);
+
+ qsort(sorted, n, sizeof(sorted[0]), dump_order_compare);
+
+ for (i = 0; i < n; i++) {
+ dns_rdataset_t *rds = sorted[i];
+
+ if (ANCIENT(rds) &&
+ (ctx->style.flags & DNS_STYLEFLAG_EXPIRED) == 0)
+ {
+ /* Omit expired entries */
+ dns_rdataset_disassociate(rds);
+ continue;
+ }
+
+ if ((ctx->style.flags & DNS_STYLEFLAG_TRUST) != 0) {
+ if ((ctx->style.flags & DNS_STYLEFLAG_INDENT) != 0 ||
+ (ctx->style.flags & DNS_STYLEFLAG_YAML) != 0)
+ {
+ unsigned int j;
+ for (j = 0; j < ctx->indent.count; j++) {
+ fprintf(f, "%s", ctx->indent.string);
+ }
+ }
+ fprintf(f, "; %s\n", dns_trust_totext(rds->trust));
+ }
+ if (((rds->attributes & DNS_RDATASETATTR_NEGATIVE) != 0) &&
+ (ctx->style.flags & DNS_STYLEFLAG_NCACHE) == 0)
+ {
+ /* Omit negative cache entries */
+ } else {
+ isc_result_t result;
+ if (STALE(rds)) {
+ fprintf(f, "; stale\n");
+ } else if (ANCIENT(rds)) {
+ isc_buffer_t b;
+ char buf[sizeof("YYYYMMDDHHMMSS")];
+ memset(buf, 0, sizeof(buf));
+ isc_buffer_init(&b, buf, sizeof(buf) - 1);
+ dns_time64_totext((uint64_t)rds->ttl, &b);
+ fprintf(f,
+ "; expired since %s "
+ "(awaiting cleanup)\n",
+ buf);
+ }
+ result = dump_rdataset(mctx, name, rds, ctx, buffer, f);
+ if (result != ISC_R_SUCCESS) {
+ dumpresult = result;
+ }
+ if ((ctx->style.flags & DNS_STYLEFLAG_OMIT_OWNER) != 0)
+ {
+ name = NULL;
+ }
+ }
+ if (((ctx->style.flags & DNS_STYLEFLAG_RESIGN) != 0) &&
+ ((rds->attributes & DNS_RDATASETATTR_RESIGN) != 0))
+ {
+ isc_buffer_t b;
+ char buf[sizeof("YYYYMMDDHHMMSS")];
+ memset(buf, 0, sizeof(buf));
+ isc_buffer_init(&b, buf, sizeof(buf) - 1);
+ dns_time64_totext((uint64_t)rds->resign, &b);
+ if ((ctx->style.flags & DNS_STYLEFLAG_INDENT) != 0 ||
+ (ctx->style.flags & DNS_STYLEFLAG_YAML) != 0)
+ {
+ unsigned int j;
+ for (j = 0; j < ctx->indent.count; j++) {
+ fprintf(f, "%s", ctx->indent.string);
+ }
+ }
+ fprintf(f, "; resign=%s\n", buf);
+ }
+ dns_rdataset_disassociate(rds);
+ }
+
+ if (dumpresult != ISC_R_SUCCESS) {
+ return (dumpresult);
+ }
+
+ /*
+ * If we got more data than could be sorted at once,
+ * go handle the rest.
+ */
+ if (itresult == ISC_R_SUCCESS) {
+ goto again;
+ }
+
+ if (itresult == ISC_R_NOMORE) {
+ itresult = ISC_R_SUCCESS;
+ }
+
+ return (itresult);
+}
+
+/*
+ * Dump given RRsets in the "raw" format.
+ */
+static isc_result_t
+dump_rdataset_raw(isc_mem_t *mctx, const dns_name_t *name,
+ dns_rdataset_t *rdataset, isc_buffer_t *buffer, FILE *f) {
+ isc_result_t result;
+ uint32_t totallen;
+ uint16_t dlen;
+ isc_region_t r, r_hdr;
+
+ REQUIRE(buffer->length > 0);
+ REQUIRE(DNS_RDATASET_VALID(rdataset));
+
+ rdataset->attributes |= DNS_RDATASETATTR_LOADORDER;
+restart:
+ totallen = 0;
+ result = dns_rdataset_first(rdataset);
+ REQUIRE(result == ISC_R_SUCCESS);
+
+ isc_buffer_clear(buffer);
+
+ /*
+ * Common header and owner name (length followed by name)
+ * These fields should be in a moderate length, so we assume we
+ * can store all of them in the initial buffer.
+ */
+ isc_buffer_availableregion(buffer, &r_hdr);
+ INSIST(r_hdr.length >= sizeof(dns_masterrawrdataset_t));
+ isc_buffer_putuint32(buffer, totallen); /* XXX: leave space */
+ isc_buffer_putuint16(buffer, rdataset->rdclass); /* 16-bit class */
+ isc_buffer_putuint16(buffer, rdataset->type); /* 16-bit type */
+ isc_buffer_putuint16(buffer, rdataset->covers); /* same as type */
+ isc_buffer_putuint32(buffer, rdataset->ttl); /* 32-bit TTL */
+ isc_buffer_putuint32(buffer, dns_rdataset_count(rdataset));
+ totallen = isc_buffer_usedlength(buffer);
+ INSIST(totallen <= sizeof(dns_masterrawrdataset_t));
+
+ dns_name_toregion(name, &r);
+ INSIST(isc_buffer_availablelength(buffer) >= (sizeof(dlen) + r.length));
+ dlen = (uint16_t)r.length;
+ isc_buffer_putuint16(buffer, dlen);
+ isc_buffer_copyregion(buffer, &r);
+ totallen += sizeof(dlen) + r.length;
+
+ do {
+ dns_rdata_t rdata = DNS_RDATA_INIT;
+
+ dns_rdataset_current(rdataset, &rdata);
+ dns_rdata_toregion(&rdata, &r);
+ INSIST(r.length <= 0xffffU);
+ dlen = (uint16_t)r.length;
+
+ /*
+ * Copy the rdata into the buffer. If the buffer is too small,
+ * grow it. This should be rare, so we'll simply restart the
+ * entire procedure (or should we copy the old data and
+ * continue?).
+ */
+ if (isc_buffer_availablelength(buffer) <
+ sizeof(dlen) + r.length)
+ {
+ int newlength;
+ void *newmem;
+
+ newlength = buffer->length * 2;
+ newmem = isc_mem_get(mctx, newlength);
+ isc_mem_put(mctx, buffer->base, buffer->length);
+ isc_buffer_init(buffer, newmem, newlength);
+ goto restart;
+ }
+ isc_buffer_putuint16(buffer, dlen);
+ isc_buffer_copyregion(buffer, &r);
+ totallen += sizeof(dlen) + r.length;
+
+ result = dns_rdataset_next(rdataset);
+ } while (result == ISC_R_SUCCESS);
+
+ if (result != ISC_R_NOMORE) {
+ return (result);
+ }
+
+ /*
+ * Fill in the total length field.
+ * XXX: this is a bit tricky. Since we have already "used" the space
+ * for the total length in the buffer, we first remember the entire
+ * buffer length in the region, "rewind", and then write the value.
+ */
+ isc_buffer_usedregion(buffer, &r);
+ isc_buffer_clear(buffer);
+ isc_buffer_putuint32(buffer, totallen);
+ INSIST(isc_buffer_usedlength(buffer) < totallen);
+
+ /*
+ * Write the buffer contents to the raw master file.
+ */
+ result = isc_stdio_write(r.base, 1, (size_t)r.length, f, NULL);
+
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR("raw master file write failed: %s",
+ isc_result_totext(result));
+ return (result);
+ }
+
+ return (result);
+}
+
+static isc_result_t
+dump_rdatasets_raw(isc_mem_t *mctx, const dns_name_t *owner_name,
+ dns_rdatasetiter_t *rdsiter, dns_totext_ctx_t *ctx,
+ isc_buffer_t *buffer, FILE *f) {
+ isc_result_t result;
+ dns_rdataset_t rdataset;
+ dns_fixedname_t fixed;
+ dns_name_t *name;
+
+ name = dns_fixedname_initname(&fixed);
+ dns_name_copy(owner_name, name);
+ for (result = dns_rdatasetiter_first(rdsiter); result == ISC_R_SUCCESS;
+ result = dns_rdatasetiter_next(rdsiter))
+ {
+ dns_rdataset_init(&rdataset);
+ dns_rdatasetiter_current(rdsiter, &rdataset);
+
+ dns_rdataset_getownercase(&rdataset, name);
+
+ if (((rdataset.attributes & DNS_RDATASETATTR_NEGATIVE) != 0) &&
+ (ctx->style.flags & DNS_STYLEFLAG_NCACHE) == 0)
+ {
+ /* Omit negative cache entries */
+ } else {
+ result = dump_rdataset_raw(mctx, name, &rdataset,
+ buffer, f);
+ }
+ dns_rdataset_disassociate(&rdataset);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+
+ if (result == ISC_R_NOMORE) {
+ result = ISC_R_SUCCESS;
+ }
+
+ return (result);
+}
+
+/*
+ * Initial size of text conversion buffer. The buffer is used
+ * for several purposes: converting origin names, rdatasets,
+ * $DATE timestamps, and comment strings for $TTL directives.
+ *
+ * When converting rdatasets, it is dynamically resized, but
+ * when converting origins, timestamps, etc it is not. Therefore,
+ * the initial size must large enough to hold the longest possible
+ * text representation of any domain name (for $ORIGIN).
+ */
+static const int initial_buffer_length = 1200;
+
+static isc_result_t
+dumptostream(dns_dumpctx_t *dctx);
+
+static void
+dumpctx_destroy(dns_dumpctx_t *dctx) {
+ dctx->magic = 0;
+ isc_mutex_destroy(&dctx->lock);
+ dns_dbiterator_destroy(&dctx->dbiter);
+ if (dctx->version != NULL) {
+ dns_db_closeversion(dctx->db, &dctx->version, false);
+ }
+ dns_db_detach(&dctx->db);
+ if (dctx->task != NULL) {
+ isc_task_detach(&dctx->task);
+ }
+ if (dctx->file != NULL) {
+ isc_mem_free(dctx->mctx, dctx->file);
+ }
+ if (dctx->tmpfile != NULL) {
+ isc_mem_free(dctx->mctx, dctx->tmpfile);
+ }
+ isc_mem_putanddetach(&dctx->mctx, dctx, sizeof(*dctx));
+}
+
+void
+dns_dumpctx_attach(dns_dumpctx_t *source, dns_dumpctx_t **target) {
+ REQUIRE(DNS_DCTX_VALID(source));
+ REQUIRE(target != NULL && *target == NULL);
+
+ isc_refcount_increment(&source->references);
+
+ *target = source;
+}
+
+void
+dns_dumpctx_detach(dns_dumpctx_t **dctxp) {
+ dns_dumpctx_t *dctx;
+
+ REQUIRE(dctxp != NULL);
+ dctx = *dctxp;
+ *dctxp = NULL;
+ REQUIRE(DNS_DCTX_VALID(dctx));
+
+ if (isc_refcount_decrement(&dctx->references) == 1) {
+ dumpctx_destroy(dctx);
+ }
+}
+
+dns_dbversion_t *
+dns_dumpctx_version(dns_dumpctx_t *dctx) {
+ REQUIRE(DNS_DCTX_VALID(dctx));
+ return (dctx->version);
+}
+
+dns_db_t *
+dns_dumpctx_db(dns_dumpctx_t *dctx) {
+ REQUIRE(DNS_DCTX_VALID(dctx));
+ return (dctx->db);
+}
+
+void
+dns_dumpctx_cancel(dns_dumpctx_t *dctx) {
+ REQUIRE(DNS_DCTX_VALID(dctx));
+
+ atomic_store_release(&dctx->canceled, true);
+}
+
+static isc_result_t
+flushandsync(FILE *f, isc_result_t result, const char *temp) {
+ bool logit = (result == ISC_R_SUCCESS);
+
+ if (result == ISC_R_SUCCESS) {
+ result = isc_stdio_flush(f);
+ }
+ if (result != ISC_R_SUCCESS && logit) {
+ if (temp != NULL) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping to master file: %s: flush: %s",
+ temp, isc_result_totext(result));
+ } else {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping to stream: flush: %s",
+ isc_result_totext(result));
+ }
+ logit = false;
+ }
+
+ if (result == ISC_R_SUCCESS) {
+ result = isc_stdio_sync(f);
+ }
+ if (result != ISC_R_SUCCESS && logit) {
+ if (temp != NULL) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping to master file: %s: fsync: %s",
+ temp, isc_result_totext(result));
+ } else {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping to stream: fsync: %s",
+ isc_result_totext(result));
+ }
+ }
+ return (result);
+}
+
+static isc_result_t
+closeandrename(FILE *f, isc_result_t result, const char *temp,
+ const char *file) {
+ isc_result_t tresult;
+ bool logit = (result == ISC_R_SUCCESS);
+
+ result = flushandsync(f, result, temp);
+ if (result != ISC_R_SUCCESS) {
+ logit = false;
+ }
+
+ tresult = isc_stdio_close(f);
+ if (result == ISC_R_SUCCESS) {
+ result = tresult;
+ }
+ if (result != ISC_R_SUCCESS && logit) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping master file: %s: fclose: %s", temp,
+ isc_result_totext(result));
+ logit = false;
+ }
+ if (result == ISC_R_SUCCESS) {
+ result = isc_file_rename(temp, file);
+ } else {
+ (void)isc_file_remove(temp);
+ }
+ if (result != ISC_R_SUCCESS && logit) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping master file: rename: %s: %s", file,
+ isc_result_totext(result));
+ }
+ return (result);
+}
+
+/*
+ * This will run in a libuv threadpool thread.
+ */
+static void
+master_dump_cb(void *data) {
+ isc_result_t result = ISC_R_UNSET;
+ dns_dumpctx_t *dctx = data;
+ REQUIRE(DNS_DCTX_VALID(dctx));
+
+ if (atomic_load_acquire(&dctx->canceled)) {
+ result = ISC_R_CANCELED;
+ } else {
+ result = dumptostream(dctx);
+ }
+
+ if (dctx->file != NULL) {
+ isc_result_t tresult = ISC_R_UNSET;
+ tresult = closeandrename(dctx->f, result, dctx->tmpfile,
+ dctx->file);
+ if (tresult != ISC_R_SUCCESS && result == ISC_R_SUCCESS) {
+ result = tresult;
+ }
+ } else {
+ result = flushandsync(dctx->f, result, NULL);
+ }
+
+ dctx->result = result;
+}
+
+/*
+ * This will run in a network/task manager thread when the dump is complete.
+ */
+static void
+master_dump_done_cb(void *data, isc_result_t result) {
+ dns_dumpctx_t *dctx = data;
+
+ if (result == ISC_R_SUCCESS && dctx->result != ISC_R_SUCCESS) {
+ result = dctx->result;
+ }
+
+ (dctx->done)(dctx->done_arg, result);
+ dns_dumpctx_detach(&dctx);
+}
+
+/*
+ * This must be run from a network/task manager thread.
+ */
+static void
+setup_dump(isc_task_t *task, isc_event_t *event) {
+ dns_dumpctx_t *dctx = NULL;
+
+ REQUIRE(isc_nm_tid() >= 0);
+ REQUIRE(event != NULL);
+
+ dctx = event->ev_arg;
+
+ REQUIRE(DNS_DCTX_VALID(dctx));
+
+ isc_nm_work_offload(isc_task_getnetmgr(task), master_dump_cb,
+ master_dump_done_cb, dctx);
+
+ isc_event_free(&event);
+}
+
+static isc_result_t
+task_send(dns_dumpctx_t *dctx) {
+ isc_event_t *event;
+
+ event = isc_event_allocate(dctx->mctx, NULL, DNS_EVENT_DUMPQUANTUM,
+ setup_dump, dctx, sizeof(*event));
+ isc_task_send(dctx->task, &event);
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+dumpctx_create(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
+ const dns_master_style_t *style, FILE *f, dns_dumpctx_t **dctxp,
+ dns_masterformat_t format, dns_masterrawheader_t *header) {
+ dns_dumpctx_t *dctx;
+ isc_result_t result;
+ unsigned int options;
+
+ dctx = isc_mem_get(mctx, sizeof(*dctx));
+
+ dctx->mctx = NULL;
+ dctx->f = f;
+ dctx->dbiter = NULL;
+ dctx->db = NULL;
+ dctx->version = NULL;
+ dctx->done = NULL;
+ dctx->done_arg = NULL;
+ dctx->task = NULL;
+ atomic_init(&dctx->canceled, false);
+ dctx->file = NULL;
+ dctx->tmpfile = NULL;
+ dctx->format = format;
+ if (header == NULL) {
+ dns_master_initrawheader(&dctx->header);
+ } else {
+ dctx->header = *header;
+ }
+
+ switch (format) {
+ case dns_masterformat_text:
+ dctx->dumpsets = dump_rdatasets_text;
+ break;
+ case dns_masterformat_raw:
+ dctx->dumpsets = dump_rdatasets_raw;
+ break;
+ default:
+ UNREACHABLE();
+ }
+
+ result = totext_ctx_init(style, NULL, &dctx->tctx);
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR("could not set master file style");
+ goto cleanup;
+ }
+
+ isc_stdtime_get(&dctx->now);
+ dns_db_attach(db, &dctx->db);
+
+ dctx->do_date = dns_db_iscache(dctx->db);
+ if (dctx->do_date) {
+ (void)dns_db_getservestalettl(dctx->db,
+ &dctx->tctx.serve_stale_ttl);
+ }
+
+ if (dctx->format == dns_masterformat_text &&
+ (dctx->tctx.style.flags & DNS_STYLEFLAG_REL_OWNER) != 0)
+ {
+ options = DNS_DB_RELATIVENAMES;
+ } else {
+ options = 0;
+ }
+ result = dns_db_createiterator(dctx->db, options, &dctx->dbiter);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ isc_mutex_init(&dctx->lock);
+
+ if (version != NULL) {
+ dns_db_attachversion(dctx->db, version, &dctx->version);
+ } else if (!dns_db_iscache(db)) {
+ dns_db_currentversion(dctx->db, &dctx->version);
+ }
+ isc_mem_attach(mctx, &dctx->mctx);
+
+ isc_refcount_init(&dctx->references, 1);
+ dctx->magic = DNS_DCTX_MAGIC;
+ *dctxp = dctx;
+ return (ISC_R_SUCCESS);
+
+cleanup:
+ if (dctx->dbiter != NULL) {
+ dns_dbiterator_destroy(&dctx->dbiter);
+ }
+ if (dctx->db != NULL) {
+ dns_db_detach(&dctx->db);
+ }
+ isc_mem_put(mctx, dctx, sizeof(*dctx));
+ return (result);
+}
+
+static isc_result_t
+writeheader(dns_dumpctx_t *dctx) {
+ isc_result_t result = ISC_R_SUCCESS;
+ isc_buffer_t buffer;
+ char *bufmem;
+ isc_region_t r;
+ dns_masterrawheader_t rawheader;
+ uint32_t rawversion, now32;
+
+ bufmem = isc_mem_get(dctx->mctx, initial_buffer_length);
+
+ isc_buffer_init(&buffer, bufmem, initial_buffer_length);
+
+ switch (dctx->format) {
+ case dns_masterformat_text:
+ /*
+ * If the database has cache semantics, output an
+ * RFC2540 $DATE directive so that the TTLs can be
+ * adjusted when it is reloaded. For zones it is not
+ * really needed, and it would make the file
+ * incompatible with pre-RFC2540 software, so we omit
+ * it in the zone case.
+ */
+ if (dctx->do_date) {
+ fprintf(dctx->f, "; using a %u second stale ttl\n",
+ dctx->tctx.serve_stale_ttl);
+ result = dns_time32_totext(dctx->now, &buffer);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ isc_buffer_usedregion(&buffer, &r);
+ fprintf(dctx->f, "$DATE %.*s\n", (int)r.length,
+ (char *)r.base);
+ }
+ break;
+ case dns_masterformat_raw:
+ r.base = (unsigned char *)&rawheader;
+ r.length = sizeof(rawheader);
+ isc_buffer_region(&buffer, &r);
+ now32 = dctx->now;
+ rawversion = 1;
+ if ((dctx->header.flags & DNS_MASTERRAW_COMPAT) != 0) {
+ rawversion = 0;
+ }
+
+ isc_buffer_putuint32(&buffer, dctx->format);
+ isc_buffer_putuint32(&buffer, rawversion);
+ isc_buffer_putuint32(&buffer, now32);
+
+ if (rawversion == 1) {
+ isc_buffer_putuint32(&buffer, dctx->header.flags);
+ isc_buffer_putuint32(&buffer,
+ dctx->header.sourceserial);
+ isc_buffer_putuint32(&buffer, dctx->header.lastxfrin);
+ }
+
+ INSIST(isc_buffer_usedlength(&buffer) <= sizeof(rawheader));
+ result = isc_stdio_write(buffer.base, 1,
+ isc_buffer_usedlength(&buffer),
+ dctx->f, NULL);
+ if (result != ISC_R_SUCCESS) {
+ break;
+ }
+
+ break;
+ default:
+ UNREACHABLE();
+ }
+
+ isc_mem_put(dctx->mctx, buffer.base, buffer.length);
+ return (result);
+}
+
+static isc_result_t
+dumptostream(dns_dumpctx_t *dctx) {
+ isc_result_t result = ISC_R_SUCCESS;
+ isc_buffer_t buffer;
+ char *bufmem;
+ dns_name_t *name;
+ dns_fixedname_t fixname;
+ unsigned int options = DNS_DB_STALEOK;
+
+ if ((dctx->tctx.style.flags & DNS_STYLEFLAG_EXPIRED) != 0) {
+ options |= DNS_DB_EXPIREDOK;
+ }
+
+ bufmem = isc_mem_get(dctx->mctx, initial_buffer_length);
+
+ isc_buffer_init(&buffer, bufmem, initial_buffer_length);
+
+ name = dns_fixedname_initname(&fixname);
+
+ CHECK(writeheader(dctx));
+
+ result = dns_dbiterator_first(dctx->dbiter);
+ if (result != ISC_R_SUCCESS && result != ISC_R_NOMORE) {
+ goto cleanup;
+ }
+
+ while (result == ISC_R_SUCCESS) {
+ dns_rdatasetiter_t *rdsiter = NULL;
+ dns_dbnode_t *node = NULL;
+
+ result = dns_dbiterator_current(dctx->dbiter, &node, name);
+ if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+ break;
+ }
+ if (result == DNS_R_NEWORIGIN) {
+ dns_name_t *origin =
+ dns_fixedname_name(&dctx->tctx.origin_fixname);
+ result = dns_dbiterator_origin(dctx->dbiter, origin);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+ if ((dctx->tctx.style.flags & DNS_STYLEFLAG_REL_DATA) !=
+ 0)
+ {
+ dctx->tctx.origin = origin;
+ }
+ dctx->tctx.neworigin = origin;
+ }
+
+ result = dns_dbiterator_pause(dctx->dbiter);
+ RUNTIME_CHECK(result == ISC_R_SUCCESS);
+
+ result = dns_db_allrdatasets(dctx->db, node, dctx->version,
+ options, dctx->now, &rdsiter);
+ if (result != ISC_R_SUCCESS) {
+ dns_db_detachnode(dctx->db, &node);
+ goto cleanup;
+ }
+ result = (dctx->dumpsets)(dctx->mctx, name, rdsiter,
+ &dctx->tctx, &buffer, dctx->f);
+ dns_rdatasetiter_destroy(&rdsiter);
+ if (result != ISC_R_SUCCESS) {
+ dns_db_detachnode(dctx->db, &node);
+ goto cleanup;
+ }
+ dns_db_detachnode(dctx->db, &node);
+ result = dns_dbiterator_next(dctx->dbiter);
+ }
+
+ if (result == ISC_R_NOMORE) {
+ result = ISC_R_SUCCESS;
+ }
+cleanup:
+ RUNTIME_CHECK(dns_dbiterator_pause(dctx->dbiter) == ISC_R_SUCCESS);
+ isc_mem_put(dctx->mctx, buffer.base, buffer.length);
+ return (result);
+}
+
+isc_result_t
+dns_master_dumptostreamasync(isc_mem_t *mctx, dns_db_t *db,
+ dns_dbversion_t *version,
+ const dns_master_style_t *style, FILE *f,
+ isc_task_t *task, dns_dumpdonefunc_t done,
+ void *done_arg, dns_dumpctx_t **dctxp) {
+ dns_dumpctx_t *dctx = NULL;
+ isc_result_t result;
+
+ REQUIRE(task != NULL);
+ REQUIRE(f != NULL);
+ REQUIRE(done != NULL);
+
+ result = dumpctx_create(mctx, db, version, style, f, &dctx,
+ dns_masterformat_text, NULL);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ isc_task_attach(task, &dctx->task);
+ dctx->done = done;
+ dctx->done_arg = done_arg;
+
+ result = task_send(dctx);
+ if (result == ISC_R_SUCCESS) {
+ dns_dumpctx_attach(dctx, dctxp);
+ return (DNS_R_CONTINUE);
+ }
+
+ dns_dumpctx_detach(&dctx);
+ return (result);
+}
+
+isc_result_t
+dns_master_dumptostream(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
+ const dns_master_style_t *style,
+ dns_masterformat_t format,
+ dns_masterrawheader_t *header, FILE *f) {
+ dns_dumpctx_t *dctx = NULL;
+ isc_result_t result;
+
+ result = dumpctx_create(mctx, db, version, style, f, &dctx, format,
+ header);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = dumptostream(dctx);
+ INSIST(result != DNS_R_CONTINUE);
+ dns_dumpctx_detach(&dctx);
+
+ result = flushandsync(f, result, NULL);
+ return (result);
+}
+
+static isc_result_t
+opentmp(isc_mem_t *mctx, dns_masterformat_t format, const char *file,
+ char **tempp, FILE **fp) {
+ FILE *f = NULL;
+ isc_result_t result;
+ char *tempname = NULL;
+ int tempnamelen;
+
+ tempnamelen = strlen(file) + 20;
+ tempname = isc_mem_allocate(mctx, tempnamelen);
+
+ result = isc_file_mktemplate(file, tempname, tempnamelen);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ if (format == dns_masterformat_text) {
+ result = isc_file_openunique(tempname, &f);
+ } else {
+ result = isc_file_bopenunique(tempname, &f);
+ }
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping master file: %s: open: %s", tempname,
+ isc_result_totext(result));
+ goto cleanup;
+ }
+
+#if defined(POSIX_FADV_DONTNEED)
+ posix_fadvise(fileno(f), 0, 0, POSIX_FADV_DONTNEED);
+#endif
+
+ *tempp = tempname;
+ *fp = f;
+ return (ISC_R_SUCCESS);
+
+cleanup:
+ isc_mem_free(mctx, tempname);
+ return (result);
+}
+
+isc_result_t
+dns_master_dumpasync(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
+ const dns_master_style_t *style, const char *filename,
+ isc_task_t *task, dns_dumpdonefunc_t done, void *done_arg,
+ dns_dumpctx_t **dctxp, dns_masterformat_t format,
+ dns_masterrawheader_t *header) {
+ FILE *f = NULL;
+ isc_result_t result;
+ char *tempname = NULL;
+ char *file = NULL;
+ dns_dumpctx_t *dctx = NULL;
+
+ file = isc_mem_strdup(mctx, filename);
+
+ result = opentmp(mctx, format, filename, &tempname, &f);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ result = dumpctx_create(mctx, db, version, style, f, &dctx, format,
+ header);
+ if (result != ISC_R_SUCCESS) {
+ (void)isc_stdio_close(f);
+ (void)isc_file_remove(tempname);
+ goto cleanup;
+ }
+
+ isc_task_attach(task, &dctx->task);
+ dctx->done = done;
+ dctx->done_arg = done_arg;
+ dctx->file = file;
+ file = NULL;
+ dctx->tmpfile = tempname;
+ tempname = NULL;
+
+ result = task_send(dctx);
+ if (result == ISC_R_SUCCESS) {
+ dns_dumpctx_attach(dctx, dctxp);
+ return (DNS_R_CONTINUE);
+ }
+
+cleanup:
+ if (dctx != NULL) {
+ dns_dumpctx_detach(&dctx);
+ }
+ if (file != NULL) {
+ isc_mem_free(mctx, file);
+ }
+ if (tempname != NULL) {
+ isc_mem_free(mctx, tempname);
+ }
+ return (result);
+}
+
+isc_result_t
+dns_master_dump(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
+ const dns_master_style_t *style, const char *filename,
+ dns_masterformat_t format, dns_masterrawheader_t *header) {
+ FILE *f = NULL;
+ isc_result_t result;
+ char *tempname;
+ dns_dumpctx_t *dctx = NULL;
+
+ result = opentmp(mctx, format, filename, &tempname, &f);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+
+ result = dumpctx_create(mctx, db, version, style, f, &dctx, format,
+ header);
+ if (result != ISC_R_SUCCESS) {
+ goto cleanup;
+ }
+
+ result = dumptostream(dctx);
+ INSIST(result != DNS_R_CONTINUE);
+ dns_dumpctx_detach(&dctx);
+
+ result = closeandrename(f, result, tempname, filename);
+
+cleanup:
+ isc_mem_free(mctx, tempname);
+ return (result);
+}
+
+/*
+ * Dump a database node into a master file.
+ * XXX: this function assumes the text format.
+ */
+isc_result_t
+dns_master_dumpnodetostream(isc_mem_t *mctx, dns_db_t *db,
+ dns_dbversion_t *version, dns_dbnode_t *node,
+ const dns_name_t *name,
+ const dns_master_style_t *style, FILE *f) {
+ isc_result_t result;
+ isc_buffer_t buffer;
+ char *bufmem;
+ isc_stdtime_t now;
+ dns_totext_ctx_t ctx;
+ dns_rdatasetiter_t *rdsiter = NULL;
+ unsigned int options = DNS_DB_STALEOK;
+
+ if ((style->flags & DNS_STYLEFLAG_EXPIRED) != 0) {
+ options |= DNS_DB_EXPIREDOK;
+ }
+
+ result = totext_ctx_init(style, NULL, &ctx);
+ if (result != ISC_R_SUCCESS) {
+ UNEXPECTED_ERROR("could not set master file style");
+ return (ISC_R_UNEXPECTED);
+ }
+
+ isc_stdtime_get(&now);
+
+ bufmem = isc_mem_get(mctx, initial_buffer_length);
+
+ isc_buffer_init(&buffer, bufmem, initial_buffer_length);
+
+ result = dns_db_allrdatasets(db, node, version, options, now, &rdsiter);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+ result = dump_rdatasets_text(mctx, name, rdsiter, &ctx, &buffer, f);
+ if (result != ISC_R_SUCCESS) {
+ goto failure;
+ }
+ dns_rdatasetiter_destroy(&rdsiter);
+
+ result = ISC_R_SUCCESS;
+
+failure:
+ isc_mem_put(mctx, buffer.base, buffer.length);
+ return (result);
+}
+
+isc_result_t
+dns_master_dumpnode(isc_mem_t *mctx, dns_db_t *db, dns_dbversion_t *version,
+ dns_dbnode_t *node, const dns_name_t *name,
+ const dns_master_style_t *style, const char *filename) {
+ FILE *f = NULL;
+ isc_result_t result;
+
+ result = isc_stdio_open(filename, "w", &f);
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping node to file: %s: open: %s", filename,
+ isc_result_totext(result));
+ return (ISC_R_UNEXPECTED);
+ }
+
+ result = dns_master_dumpnodetostream(mctx, db, version, node, name,
+ style, f);
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping master file: %s: dump: %s", filename,
+ isc_result_totext(result));
+ (void)isc_stdio_close(f);
+ return (ISC_R_UNEXPECTED);
+ }
+
+ result = isc_stdio_close(f);
+ if (result != ISC_R_SUCCESS) {
+ isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
+ DNS_LOGMODULE_MASTERDUMP, ISC_LOG_ERROR,
+ "dumping master file: %s: close: %s", filename,
+ isc_result_totext(result));
+ return (ISC_R_UNEXPECTED);
+ }
+
+ return (result);
+}
+
+dns_masterstyle_flags_t
+dns_master_styleflags(const dns_master_style_t *style) {
+ REQUIRE(style != NULL);
+ return (style->flags);
+}
+
+isc_result_t
+dns_master_stylecreate(dns_master_style_t **stylep,
+ dns_masterstyle_flags_t flags, unsigned int ttl_column,
+ unsigned int class_column, unsigned int type_column,
+ unsigned int rdata_column, unsigned int line_length,
+ unsigned int tab_width, unsigned int split_width,
+ isc_mem_t *mctx) {
+ dns_master_style_t *style;
+
+ REQUIRE(stylep != NULL && *stylep == NULL);
+ style = isc_mem_get(mctx, sizeof(*style));
+
+ style->flags = flags;
+ style->ttl_column = ttl_column;
+ style->class_column = class_column;
+ style->type_column = type_column;
+ style->rdata_column = rdata_column;
+ style->line_length = line_length;
+ style->tab_width = tab_width;
+ style->split_width = split_width;
+ *stylep = style;
+ return (ISC_R_SUCCESS);
+}
+
+void
+dns_master_styledestroy(dns_master_style_t **stylep, isc_mem_t *mctx) {
+ dns_master_style_t *style;
+
+ REQUIRE(stylep != NULL && *stylep != NULL);
+ style = *stylep;
+ *stylep = NULL;
+ isc_mem_put(mctx, style, sizeof(*style));
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 06:55:33 +0000