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-rw-r--r--source4/dns_server/dns_update.c303
1 files changed, 303 insertions, 0 deletions
diff --git a/source4/dns_server/dns_update.c b/source4/dns_server/dns_update.c
index 397384421c..64b6181d7e 100644
--- a/source4/dns_server/dns_update.c
+++ b/source4/dns_server/dns_update.c
@@ -344,6 +344,304 @@ done:
return WERR_OK;
}
+
+static WERROR handle_one_update(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
+ const struct dns_name_question *zone,
+ const struct dns_res_rec *update)
+{
+ struct dnsp_DnssrvRpcRecord *recs = NULL;
+ uint16_t rcount = 0;
+ struct ldb_dn *dn;
+ uint16_t i;
+ WERROR werror;
+ bool needs_add = false;
+
+ DEBUG(1, ("Looking at record: \n"));
+ NDR_PRINT_DEBUG(dns_res_rec, discard_const(update));
+
+ switch (update->rr_type) {
+ case DNS_QTYPE_A:
+ break;
+ case DNS_QTYPE_NS:
+ break;
+ case DNS_QTYPE_CNAME:
+ break;
+ case DNS_QTYPE_SOA:
+ break;
+ case DNS_QTYPE_PTR:
+ break;
+ case DNS_QTYPE_MX:
+ break;
+ case DNS_QTYPE_AAAA:
+ break;
+ case DNS_QTYPE_SRV:
+ break;
+ case DNS_QTYPE_TXT:
+ break;
+ default:
+ return DNS_ERR(NOT_IMPLEMENTED);
+ }
+
+ werror = dns_name2dn(dns, mem_ctx, update->name, &dn);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ werror = dns_lookup_records(dns, mem_ctx, dn, &recs, &rcount);
+ if (W_ERROR_EQUAL(werror, DNS_ERR(NAME_ERROR))) {
+ recs = NULL;
+ rcount = 0;
+ needs_add = true;
+ werror = WERR_OK;
+ }
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ if (update->rr_class == zone->question_class) {
+ if (update->rr_type == DNS_QTYPE_CNAME) {
+ /*
+ * If there is a record in the directory
+ * that's not a CNAME, ignore update
+ */
+ for (i = 0; i < rcount; i++) {
+ if (recs[i].wType != DNS_TYPE_CNAME) {
+ DEBUG(0, ("Skipping update\n"));
+ return WERR_OK;
+ }
+ break;
+ }
+
+ /*
+ * There should be no entries besides one CNAME record
+ * per name, so replace everything with the new CNAME
+ */
+
+ rcount = 1;
+ recs = talloc_realloc(mem_ctx, recs,
+ struct dnsp_DnssrvRpcRecord, rcount);
+ W_ERROR_HAVE_NO_MEMORY(recs);
+
+ werror = dns_rr_to_dnsp(recs, update, &recs[0]);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ werror = dns_replace_records(dns, mem_ctx, dn,
+ needs_add, recs, rcount);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ return WERR_OK;
+ } else {
+ /*
+ * If there is a CNAME record for this name,
+ * ignore update
+ */
+ for (i = 0; i < rcount; i++) {
+ if (recs[i].wType == DNS_TYPE_CNAME) {
+ DEBUG(0, ("Skipping update\n"));
+ return WERR_OK;
+ }
+ }
+ }
+ if (update->rr_type == DNS_QTYPE_SOA) {
+ bool found = false;
+
+ /*
+ * If the zone has no SOA record?? or update's
+ * serial number is smaller than existing SOA's,
+ * ignore update
+ */
+ for (i = 0; i < rcount; i++) {
+ if (recs[i].wType == DNS_TYPE_SOA) {
+ uint16_t n, o;
+
+ n = update->rdata.soa_record.serial;
+ o = recs[i].data.soa.serial;
+ /*
+ * TODO: Implement RFC 1982 comparison
+ * logic for RFC2136
+ */
+ if (n <= o) {
+ DEBUG(0, ("Skipping update\n"));
+ return WERR_OK;
+ }
+ found = true;
+ break;
+ }
+ }
+ if (!found) {
+ DEBUG(0, ("Skipping update\n"));
+ return WERR_OK;
+ }
+
+ werror = dns_rr_to_dnsp(mem_ctx, update, &recs[i]);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ for (i++; i < rcount; i++) {
+ if (recs[i].wType != DNS_TYPE_SOA) {
+ continue;
+ }
+
+ ZERO_STRUCT(recs[i]);
+ }
+
+ werror = dns_replace_records(dns, mem_ctx, dn,
+ needs_add, recs, rcount);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ return WERR_OK;
+ }
+
+ recs = talloc_realloc(mem_ctx, recs,
+ struct dnsp_DnssrvRpcRecord, rcount+1);
+ W_ERROR_HAVE_NO_MEMORY(recs);
+
+ werror = dns_rr_to_dnsp(recs, update, &recs[rcount]);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ for (i = 0; i < rcount; i++) {
+ if (!dns_records_match(&recs[i], &recs[rcount])) {
+ continue;
+ }
+
+ recs[i] = recs[rcount];
+
+ werror = dns_replace_records(dns, mem_ctx, dn,
+ needs_add, recs, rcount);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ return WERR_OK;
+ }
+
+ werror = dns_replace_records(dns, mem_ctx, dn,
+ needs_add, recs, rcount+1);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ return WERR_OK;
+ } else if (update->rr_class == DNS_QCLASS_ANY) {
+ if (update->rr_type == DNS_QTYPE_ALL) {
+ if (dns_name_equal(update->name, zone->name)) {
+ for (i = 0; i < rcount; i++) {
+
+ if (recs[i].wType == DNS_TYPE_SOA) {
+ continue;
+ }
+
+ if (recs[i].wType == DNS_TYPE_NS) {
+ continue;
+ }
+
+ ZERO_STRUCT(recs[i]);
+ }
+
+ } else {
+ for (i = 0; i < rcount; i++) {
+ ZERO_STRUCT(recs[i]);
+ }
+ }
+
+ } else if (dns_name_equal(update->name, zone->name)) {
+
+ if (update->rr_type == DNS_QTYPE_SOA) {
+ return WERR_OK;
+ }
+
+ if (update->rr_type == DNS_QTYPE_NS) {
+ return WERR_OK;
+ }
+ }
+ for (i = 0; i < rcount; i++) {
+ if (recs[i].wType == update->rr_type) {
+ ZERO_STRUCT(recs[i]);
+ }
+ }
+
+ werror = dns_replace_records(dns, mem_ctx, dn,
+ needs_add, recs, rcount);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ return WERR_OK;
+ } else if (update->rr_class == DNS_QCLASS_NONE) {
+ struct dnsp_DnssrvRpcRecord *del_rec;
+
+ if (update->rr_type == DNS_QTYPE_SOA) {
+ return WERR_OK;
+ }
+ if (update->rr_type == DNS_QTYPE_NS) {
+ bool found = false;
+ struct dnsp_DnssrvRpcRecord *ns_rec = talloc(mem_ctx,
+ struct dnsp_DnssrvRpcRecord);
+ W_ERROR_HAVE_NO_MEMORY(ns_rec);
+
+
+ werror = dns_rr_to_dnsp(ns_rec, update, ns_rec);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ for (i = 0; i < rcount; i++) {
+ if (dns_records_match(ns_rec, &recs[i])) {
+ found = true;
+ break;
+ }
+ }
+ if (found) {
+ return WERR_OK;
+ }
+ }
+
+ del_rec = talloc(mem_ctx, struct dnsp_DnssrvRpcRecord);
+ W_ERROR_HAVE_NO_MEMORY(del_rec);
+
+ werror = dns_rr_to_dnsp(del_rec, update, del_rec);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ for (i = 0; i < rcount; i++) {
+ if (dns_records_match(del_rec, &recs[i])) {
+ ZERO_STRUCT(recs[i]);
+ }
+ }
+ }
+
+ return WERR_OK;
+}
+
+static WERROR handle_updates(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
+ const struct dns_name_question *zone,
+ const struct dns_res_rec *prereqs, uint16_t pcount,
+ struct dns_res_rec *updates, uint16_t upd_count)
+{
+ struct ldb_dn *zone_dn = NULL;
+ WERROR werror = WERR_OK;
+ int ret;
+ uint16_t ri;
+ TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
+
+ werror = dns_name2dn(dns, tmp_ctx, zone->name, &zone_dn);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ ret = ldb_transaction_start(dns->samdb);
+ if (ret != LDB_SUCCESS) {
+ return DNS_ERR(SERVER_FAILURE);
+ }
+
+ werror = check_prerequisites(dns, tmp_ctx, zone, prereqs, pcount);
+ W_ERROR_NOT_OK_GOTO(werror, failed);
+
+ DEBUG(0, ("update count is %u\n", upd_count));
+
+ for (ri = 0; ri < upd_count; ri++) {
+ werror = handle_one_update(dns, tmp_ctx, zone,
+ &updates[ri]);
+ W_ERROR_NOT_OK_GOTO(werror, failed);
+ }
+
+ ldb_transaction_commit(dns->samdb);
+ TALLOC_FREE(tmp_ctx);
+ return WERR_OK;
+
+failed:
+ ldb_transaction_cancel(dns->samdb);
+ TALLOC_FREE(tmp_ctx);
+ return werror;
+
+}
+
WERROR dns_server_process_update(struct dns_server *dns,
TALLOC_CTX *mem_ctx,
struct dns_name_packet *in,
@@ -410,5 +708,10 @@ WERROR dns_server_process_update(struct dns_server *dns,
werror = update_prescan(in->questions, *updates, *update_count);
W_ERROR_NOT_OK_RETURN(werror);
+
+ werror = handle_updates(dns, mem_ctx, in->questions, *prereqs,
+ *prereq_count, *updates, *update_count);
+ W_ERROR_NOT_OK_RETURN(werror);
+
return werror;
}
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