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-rw-r--r--contrib/dlz/example/dlz_example.c820
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diff --git a/contrib/dlz/example/dlz_example.c b/contrib/dlz/example/dlz_example.c
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+++ b/contrib/dlz/example/dlz_example.c
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+/*
+ * Copyright (C) 2011 Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: ISC
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This provides a very simple example of an external loadable DLZ
+ * driver, with update support.
+ */
+
+#include <inttypes.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../modules/include/dlz_minimal.h"
+
+#define CHECK(x) \
+ do { \
+ result = (x); \
+ if (result != ISC_R_SUCCESS) \
+ goto failure; \
+ } while (0)
+
+/* For this simple example, use fixed sized strings */
+struct record {
+ char name[100];
+ char type[10];
+ char data[200];
+ dns_ttl_t ttl;
+};
+
+#define MAX_RECORDS 100
+
+struct dlz_example_data {
+ char *zone_name;
+
+ /* An example driver doesn't need good memory management :-) */
+ struct record current[MAX_RECORDS];
+ struct record adds[MAX_RECORDS];
+ struct record deletes[MAX_RECORDS];
+
+ bool transaction_started;
+
+ /* Helper functions from the dlz_dlopen driver */
+ log_t *log;
+ dns_sdlz_putrr_t *putrr;
+ dns_sdlz_putnamedrr_t *putnamedrr;
+ dns_dlz_writeablezone_t *writeable_zone;
+};
+
+static bool
+single_valued(const char *type) {
+ const char *single[] = { "soa", "cname", NULL };
+ int i;
+
+ for (i = 0; single[i]; i++) {
+ if (strcasecmp(single[i], type) == 0) {
+ return (true);
+ }
+ }
+ return (false);
+}
+
+/*
+ * Add a record to a list
+ */
+static isc_result_t
+add_name(struct dlz_example_data *state, struct record *list, const char *name,
+ const char *type, dns_ttl_t ttl, const char *data) {
+ int i;
+ bool single = single_valued(type);
+ int first_empty = -1;
+
+ for (i = 0; i < MAX_RECORDS; i++) {
+ if (first_empty == -1 && strlen(list[i].name) == 0U) {
+ first_empty = i;
+ }
+ if (strcasecmp(list[i].name, name) != 0) {
+ continue;
+ }
+ if (strcasecmp(list[i].type, type) != 0) {
+ continue;
+ }
+ if (!single && strcasecmp(list[i].data, data) != 0) {
+ continue;
+ }
+ break;
+ }
+ if (i == MAX_RECORDS && first_empty != -1) {
+ i = first_empty;
+ }
+ if (i == MAX_RECORDS) {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_ERROR, "dlz_example: out of record "
+ "space");
+ }
+ return (ISC_R_FAILURE);
+ }
+
+ if (strlen(name) >= sizeof(list[i].name) ||
+ strlen(type) >= sizeof(list[i].type) ||
+ strlen(data) >= sizeof(list[i].data))
+ {
+ return (ISC_R_NOSPACE);
+ }
+
+ strncpy(list[i].name, name, sizeof(list[i].name));
+ list[i].name[sizeof(list[i].name) - 1] = '\0';
+
+ strncpy(list[i].type, type, sizeof(list[i].type));
+ list[i].type[sizeof(list[i].type) - 1] = '\0';
+
+ strncpy(list[i].data, data, sizeof(list[i].data));
+ list[i].data[sizeof(list[i].data) - 1] = '\0';
+
+ list[i].ttl = ttl;
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Delete a record from a list
+ */
+static isc_result_t
+del_name(struct dlz_example_data *state, struct record *list, const char *name,
+ const char *type, dns_ttl_t ttl, const char *data) {
+ int i;
+
+ UNUSED(state);
+
+ for (i = 0; i < MAX_RECORDS; i++) {
+ if (strcasecmp(name, list[i].name) == 0 &&
+ strcasecmp(type, list[i].type) == 0 &&
+ strcasecmp(data, list[i].data) == 0 && ttl == list[i].ttl)
+ {
+ break;
+ }
+ }
+ if (i == MAX_RECORDS) {
+ return (ISC_R_NOTFOUND);
+ }
+ memset(&list[i], 0, sizeof(struct record));
+ return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+fmt_address(isc_sockaddr_t *addr, char *buffer, size_t size) {
+ char addr_buf[100];
+ const char *ret;
+ uint16_t port = 0;
+
+ switch (addr->type.sa.sa_family) {
+ case AF_INET:
+ port = ntohs(addr->type.sin.sin_port);
+ ret = inet_ntop(AF_INET, &addr->type.sin.sin_addr, addr_buf,
+ sizeof(addr_buf));
+ break;
+ case AF_INET6:
+ port = ntohs(addr->type.sin6.sin6_port);
+ ret = inet_ntop(AF_INET6, &addr->type.sin6.sin6_addr, addr_buf,
+ sizeof(addr_buf));
+ break;
+ default:
+ return (ISC_R_FAILURE);
+ }
+
+ if (ret == NULL) {
+ return (ISC_R_FAILURE);
+ }
+
+ snprintf(buffer, size, "%s#%u", addr_buf, port);
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Return the version of the API
+ */
+int
+dlz_version(unsigned int *flags) {
+ UNUSED(flags);
+ return (DLZ_DLOPEN_VERSION);
+}
+
+/*
+ * Remember a helper function from the bind9 dlz_dlopen driver
+ */
+static void
+b9_add_helper(struct dlz_example_data *state, const char *helper_name,
+ void *ptr) {
+ if (strcmp(helper_name, "log") == 0) {
+ state->log = (log_t *)ptr;
+ }
+ if (strcmp(helper_name, "putrr") == 0) {
+ state->putrr = (dns_sdlz_putrr_t *)ptr;
+ }
+ if (strcmp(helper_name, "putnamedrr") == 0) {
+ state->putnamedrr = (dns_sdlz_putnamedrr_t *)ptr;
+ }
+ if (strcmp(helper_name, "writeable_zone") == 0) {
+ state->writeable_zone = (dns_dlz_writeablezone_t *)ptr;
+ }
+}
+
+/*
+ * Called to initialize the driver
+ */
+isc_result_t
+dlz_create(const char *dlzname, unsigned int argc, char *argv[], void **dbdata,
+ ...) {
+ struct dlz_example_data *state;
+ const char *helper_name;
+ va_list ap;
+ char soa_data[200];
+ const char *extra;
+ isc_result_t result;
+ int n;
+
+ UNUSED(dlzname);
+
+ state = calloc(1, sizeof(struct dlz_example_data));
+ if (state == NULL) {
+ return (ISC_R_NOMEMORY);
+ }
+
+ /* Fill in the helper functions */
+ va_start(ap, dbdata);
+ while ((helper_name = va_arg(ap, const char *)) != NULL) {
+ b9_add_helper(state, helper_name, va_arg(ap, void *));
+ }
+ va_end(ap);
+
+ if (argc < 2 || argv[1][0] == '\0') {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_ERROR, "dlz_example: please specify "
+ "a zone name");
+ }
+ dlz_destroy(state);
+ return (ISC_R_FAILURE);
+ }
+
+ /* Ensure zone name is absolute */
+ state->zone_name = malloc(strlen(argv[1]) + 2);
+ if (state->zone_name == NULL) {
+ free(state);
+ return (ISC_R_NOMEMORY);
+ }
+ if (argv[1][strlen(argv[1]) - 1] == '.') {
+ strcpy(state->zone_name, argv[1]);
+ } else {
+ sprintf(state->zone_name, "%s.", argv[1]);
+ }
+
+ if (strcmp(state->zone_name, ".") == 0) {
+ extra = ".root";
+ } else {
+ extra = ".";
+ }
+
+ n = sprintf(soa_data, "%s hostmaster%s%s 123 900 600 86400 3600",
+ state->zone_name, extra, state->zone_name);
+
+ if (n < 0) {
+ CHECK(ISC_R_FAILURE);
+ }
+ if ((unsigned)n >= sizeof(soa_data)) {
+ CHECK(ISC_R_NOSPACE);
+ }
+
+ add_name(state, &state->current[0], state->zone_name, "soa", 3600,
+ soa_data);
+ add_name(state, &state->current[0], state->zone_name, "ns", 3600,
+ state->zone_name);
+ add_name(state, &state->current[0], state->zone_name, "a", 1800,
+ "10.53.0.1");
+
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO, "dlz_example: started for zone %s",
+ state->zone_name);
+ }
+
+ *dbdata = state;
+ return (ISC_R_SUCCESS);
+
+failure:
+ free(state);
+ return (result);
+}
+
+/*
+ * Shut down the backend
+ */
+void
+dlz_destroy(void *dbdata) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO, "dlz_example: shutting down zone %s",
+ state->zone_name);
+ }
+ free(state->zone_name);
+ free(state);
+}
+
+/*
+ * See if we handle a given zone
+ */
+isc_result_t
+dlz_findzonedb(void *dbdata, const char *name, dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+ isc_sockaddr_t *src;
+ char addrbuf[100];
+ char absolute[1024];
+
+ strcpy(addrbuf, "unknown");
+ if (methods != NULL && methods->sourceip != NULL &&
+ methods->version - methods->age <= DNS_CLIENTINFOMETHODS_VERSION &&
+ DNS_CLIENTINFOMETHODS_VERSION <= methods->version)
+ {
+ methods->sourceip(clientinfo, &src);
+ fmt_address(src, addrbuf, sizeof(addrbuf));
+ }
+ state->log(ISC_LOG_INFO, "dlz_example: findzonedb connection from: %s",
+ addrbuf);
+
+ state->log(ISC_LOG_INFO,
+ "dlz_example: dlz_findzonedb called with name '%s' "
+ "in zone DB '%s'",
+ name, state->zone_name);
+
+ /*
+ * Returning ISC_R_NOTFOUND will cause the query logic to
+ * check the database for parent names, looking for zone cuts.
+ *
+ * Returning ISC_R_NOMORE prevents the query logic from doing
+ * this; it will move onto the next database after a single query.
+ */
+ if (strcasecmp(name, "test.example.com") == 0) {
+ return (ISC_R_NOMORE);
+ }
+
+ /*
+ * For example.net, only return ISC_R_NOMORE when queried
+ * from 10.53.0.1.
+ */
+ if (strcasecmp(name, "test.example.net") == 0 &&
+ strncmp(addrbuf, "10.53.0.1", 9) == 0)
+ {
+ return (ISC_R_NOMORE);
+ }
+
+ if (strcasecmp(state->zone_name, name) == 0) {
+ return (ISC_R_SUCCESS);
+ }
+
+ snprintf(absolute, sizeof(absolute), "%s.", name);
+ if (strcasecmp(state->zone_name, absolute) == 0) {
+ return (ISC_R_SUCCESS);
+ }
+
+ return (ISC_R_NOTFOUND);
+}
+
+/*
+ * Look up one record in the sample database.
+ *
+ * If the queryname is "source-addr", send back a TXT record containing
+ * the address of the client; this demonstrates the use of 'methods'
+ * and 'clientinfo'.
+ *
+ * If the queryname is "too-long", send back a TXT record that's too long
+ * to process; this should result in a SERVFAIL when queried.
+ */
+isc_result_t
+dlz_lookup(const char *zone, const char *name, void *dbdata,
+ dns_sdlzlookup_t *lookup, dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo) {
+ isc_result_t result;
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+ bool found = false;
+ void *dbversion = NULL;
+ isc_sockaddr_t *src;
+ char full_name[256];
+ char buf[512];
+ int i;
+
+ UNUSED(zone);
+
+ if (state->putrr == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ if (strcmp(name, "@") == 0) {
+ strncpy(full_name, state->zone_name, 255);
+ full_name[255] = '\0';
+ } else {
+ snprintf(full_name, 255, "%s.%s", name, state->zone_name);
+ }
+
+ /*
+ * If we need to know the database version (as set in
+ * the 'newversion' dlz function) we can pick it up from the
+ * clientinfo.
+ *
+ * This allows a lookup to query the correct version of the DNS
+ * data, if the DLZ can differentiate between versions.
+ *
+ * For example, if a new database transaction is created by
+ * 'newversion', the lookup should query within the same
+ * transaction scope if it can.
+ *
+ * If the DLZ only operates on 'live' data, then version
+ * wouldn't necessarily be needed.
+ */
+ if (clientinfo != NULL && clientinfo->version >= 2) {
+ dbversion = clientinfo->dbversion;
+ if (dbversion != NULL && *(bool *)dbversion) {
+ state->log(ISC_LOG_INFO, "dlz_example: lookup against "
+ "live "
+ "transaction\n");
+ }
+ }
+
+ if (strcmp(name, "source-addr") == 0) {
+ char ecsbuf[DNS_ECS_FORMATSIZE] = "not supported";
+ strncpy(buf, "unknown", sizeof(buf));
+ if (methods != NULL && methods->sourceip != NULL &&
+ (methods->version - methods->age <=
+ DNS_CLIENTINFOMETHODS_VERSION) &&
+ DNS_CLIENTINFOMETHODS_VERSION <= methods->version)
+ {
+ methods->sourceip(clientinfo, &src);
+ fmt_address(src, buf, sizeof(buf));
+ }
+ if (clientinfo != NULL && clientinfo->version >= 3) {
+ if (clientinfo->ecs.addr.family != AF_UNSPEC) {
+ dns_ecs_format(&clientinfo->ecs, ecsbuf,
+ sizeof(ecsbuf));
+ } else {
+ snprintf(ecsbuf, sizeof(ecsbuf), "%s",
+ "not present");
+ }
+ }
+ i = strlen(buf);
+ snprintf(buf + i, sizeof(buf) - i - 1, " ECS %s", ecsbuf);
+
+ state->log(ISC_LOG_INFO,
+ "dlz_example: lookup connection from: %s", buf);
+
+ found = true;
+ result = state->putrr(lookup, "TXT", 0, buf);
+ /* We could also generate a CNAME RR:
+ snprintf(buf, sizeof(buf), "%s.redirect.example.", ecsbuf);
+ result = state->putrr(lookup, "CNAME", 0, buf); */
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+
+ if (strcmp(name, "too-long") == 0) {
+ for (i = 0; i < 511; i++) {
+ buf[i] = 'x';
+ }
+ buf[i] = '\0';
+ found = true;
+ result = state->putrr(lookup, "TXT", 0, buf);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+
+ for (i = 0; i < MAX_RECORDS; i++) {
+ if (strcasecmp(state->current[i].name, full_name) == 0) {
+ found = true;
+ result = state->putrr(lookup, state->current[i].type,
+ state->current[i].ttl,
+ state->current[i].data);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+ }
+
+ if (!found) {
+ return (ISC_R_NOTFOUND);
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * See if a zone transfer is allowed
+ */
+isc_result_t
+dlz_allowzonexfr(void *dbdata, const char *name, const char *client) {
+ UNUSED(client);
+
+ /* Just say yes for all our zones */
+ return (dlz_findzonedb(dbdata, name, NULL, NULL));
+}
+
+/*
+ * Perform a zone transfer
+ */
+isc_result_t
+dlz_allnodes(const char *zone, void *dbdata, dns_sdlzallnodes_t *allnodes) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+ int i;
+
+ UNUSED(zone);
+
+ if (state->putnamedrr == NULL) {
+ return (ISC_R_NOTIMPLEMENTED);
+ }
+
+ for (i = 0; i < MAX_RECORDS; i++) {
+ isc_result_t result;
+ if (strlen(state->current[i].name) == 0U) {
+ continue;
+ }
+ result = state->putnamedrr(allnodes, state->current[i].name,
+ state->current[i].type,
+ state->current[i].ttl,
+ state->current[i].data);
+ if (result != ISC_R_SUCCESS) {
+ return (result);
+ }
+ }
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Start a transaction
+ */
+isc_result_t
+dlz_newversion(const char *zone, void *dbdata, void **versionp) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+
+ if (state->transaction_started) {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: transaction already "
+ "started for zone %s",
+ zone);
+ }
+ return (ISC_R_FAILURE);
+ }
+
+ state->transaction_started = true;
+ *versionp = (void *)&state->transaction_started;
+
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * End a transaction
+ */
+void
+dlz_closeversion(const char *zone, bool commit, void *dbdata, void **versionp) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+
+ if (!state->transaction_started) {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: transaction not "
+ "started for zone %s",
+ zone);
+ }
+ *versionp = NULL;
+ return;
+ }
+
+ state->transaction_started = false;
+
+ *versionp = NULL;
+
+ if (commit) {
+ int i;
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: committing "
+ "transaction on zone %s",
+ zone);
+ }
+ for (i = 0; i < MAX_RECORDS; i++) {
+ if (strlen(state->deletes[i].name) > 0U) {
+ (void)del_name(state, &state->current[0],
+ state->deletes[i].name,
+ state->deletes[i].type,
+ state->deletes[i].ttl,
+ state->deletes[i].data);
+ }
+ }
+ for (i = 0; i < MAX_RECORDS; i++) {
+ if (strlen(state->adds[i].name) > 0U) {
+ (void)add_name(state, &state->current[0],
+ state->adds[i].name,
+ state->adds[i].type,
+ state->adds[i].ttl,
+ state->adds[i].data);
+ }
+ }
+ } else {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: cancelling "
+ "transaction on zone %s",
+ zone);
+ }
+ }
+ memset(state->adds, 0, sizeof(state->adds));
+ memset(state->deletes, 0, sizeof(state->deletes));
+}
+
+/*
+ * Configure a writeable zone
+ */
+isc_result_t
+dlz_configure(dns_view_t *view, dns_dlzdb_t *dlzdb, void *dbdata) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+ isc_result_t result;
+
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO, "dlz_example: starting configure");
+ }
+
+ if (state->writeable_zone == NULL) {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO, "dlz_example: no "
+ "writeable_zone method "
+ "available");
+ }
+ return (ISC_R_FAILURE);
+ }
+
+ result = state->writeable_zone(view, dlzdb, state->zone_name);
+ if (result != ISC_R_SUCCESS) {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_ERROR,
+ "dlz_example: failed to "
+ "configure zone %s",
+ state->zone_name);
+ }
+ return (result);
+ }
+
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: configured writeable "
+ "zone %s",
+ state->zone_name);
+ }
+ return (ISC_R_SUCCESS);
+}
+
+/*
+ * Authorize a zone update
+ */
+bool
+dlz_ssumatch(const char *signer, const char *name, const char *tcpaddr,
+ const char *type, const char *key, uint32_t keydatalen,
+ unsigned char *keydata, void *dbdata) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+
+ UNUSED(tcpaddr);
+ UNUSED(type);
+ UNUSED(key);
+ UNUSED(keydatalen);
+ UNUSED(keydata);
+
+ if (strncmp(name, "deny.", 5) == 0) {
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: denying update "
+ "of name=%s by %s",
+ name, signer);
+ }
+ return (false);
+ }
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: allowing update of "
+ "name=%s by %s",
+ name, signer);
+ }
+ return (true);
+}
+
+static isc_result_t
+modrdataset(struct dlz_example_data *state, const char *name,
+ const char *rdatastr, struct record *list) {
+ char *full_name, *dclass, *type, *data, *ttlstr, *buf;
+ char absolute[1024];
+ isc_result_t result;
+ char *saveptr = NULL;
+
+ buf = strdup(rdatastr);
+ if (buf == NULL) {
+ return (ISC_R_FAILURE);
+ }
+
+ /*
+ * The format is:
+ * FULLNAME\tTTL\tDCLASS\tTYPE\tDATA
+ *
+ * The DATA field is space separated, and is in the data format
+ * for the type used by dig
+ */
+
+ full_name = strtok_r(buf, "\t", &saveptr);
+ if (full_name == NULL) {
+ goto error;
+ }
+
+ ttlstr = strtok_r(NULL, "\t", &saveptr);
+ if (ttlstr == NULL) {
+ goto error;
+ }
+
+ dclass = strtok_r(NULL, "\t", &saveptr);
+ if (dclass == NULL) {
+ goto error;
+ }
+
+ type = strtok_r(NULL, "\t", &saveptr);
+ if (type == NULL) {
+ goto error;
+ }
+
+ data = strtok_r(NULL, "\t", &saveptr);
+ if (data == NULL) {
+ goto error;
+ }
+
+ if (name[strlen(name) - 1] != '.') {
+ snprintf(absolute, sizeof(absolute), "%s.", name);
+ name = absolute;
+ }
+
+ result = add_name(state, list, name, type, strtoul(ttlstr, NULL, 10),
+ data);
+ free(buf);
+ return (result);
+
+error:
+ free(buf);
+ return (ISC_R_FAILURE);
+}
+
+isc_result_t
+dlz_addrdataset(const char *name, const char *rdatastr, void *dbdata,
+ void *version) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+
+ if (version != (void *)&state->transaction_started) {
+ return (ISC_R_FAILURE);
+ }
+
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO, "dlz_example: adding rdataset %s '%s'",
+ name, rdatastr);
+ }
+
+ return (modrdataset(state, name, rdatastr, &state->adds[0]));
+}
+
+isc_result_t
+dlz_subrdataset(const char *name, const char *rdatastr, void *dbdata,
+ void *version) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+
+ if (version != (void *)&state->transaction_started) {
+ return (ISC_R_FAILURE);
+ }
+
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: subtracting rdataset "
+ "%s '%s'",
+ name, rdatastr);
+ }
+
+ return (modrdataset(state, name, rdatastr, &state->deletes[0]));
+}
+
+isc_result_t
+dlz_delrdataset(const char *name, const char *type, void *dbdata,
+ void *version) {
+ struct dlz_example_data *state = (struct dlz_example_data *)dbdata;
+
+ if (version != (void *)&state->transaction_started) {
+ return (ISC_R_FAILURE);
+ }
+
+ if (state->log != NULL) {
+ state->log(ISC_LOG_INFO,
+ "dlz_example: deleting rdataset %s "
+ "of type %s",
+ name, type);
+ }
+
+ return (ISC_R_SUCCESS);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-03 18:13:10 +0000