/src/bind9/lib/dns/keytable.c

Source
/*
 * 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 <stdbool.h>

#include <isc/mem.h>
#include <isc/refcount.h>
#include <isc/result.h>
#include <isc/rwlock.h>
#include <isc/string.h>
#include <isc/util.h>

#include <dns/dnssec.h>
#include <dns/fixedname.h>
#include <dns/keytable.h>
#include <dns/qp.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatastruct.h>
#include <dns/view.h>

#define KEYTABLE_MAGIC     ISC_MAGIC('K', 'T', 'b', 'l')
#define VALID_KEYTABLE(kt) ISC_MAGIC_VALID(kt, KEYTABLE_MAGIC)

#define KEYNODE_MAGIC   ISC_MAGIC('K', 'N', 'o', 'd')
#define VALID_KEYNODE(kn) ISC_MAGIC_VALID(kn, KEYNODE_MAGIC)

struct dns_keytable {
  unsigned int magic;
  isc_mem_t *mctx;
  isc_refcount_t references;
  isc_rwlock_t rwlock;
  dns_qpmulti_t *table;
};

struct dns_keynode {
  unsigned int magic;
  isc_mem_t *mctx;
  isc_refcount_t references;
  isc_rwlock_t rwlock;
  dns_name_t name;
  dns_rdatalist_t *dslist;
  dns_rdataset_t dsset;
  bool managed;
  bool initial;
};

static dns_keynode_t *
new_keynode(const dns_name_t *name, dns_rdata_ds_t *ds,
      dns_keytable_t *keytable, bool managed, bool initial);

/* QP trie methods */
static void
qp_attach(void *uctx, void *pval, uint32_t ival);
static void
qp_detach(void *uctx, void *pval, uint32_t ival);
static size_t
qp_makekey(dns_qpkey_t key, void *uctx, void *pval, uint32_t ival);
static void
qp_triename(void *uctx, char *buf, size_t size);

static dns_qpmethods_t qpmethods = {
  qp_attach,
  qp_detach,
  qp_makekey,
  qp_triename,
};

/* rdataset methods */
static void
keynode_disassociate(dns_rdataset_t *rdataset DNS__DB_FLARG);
static isc_result_t
keynode_first(dns_rdataset_t *rdataset);
static isc_result_t
keynode_next(dns_rdataset_t *rdataset);
static void
keynode_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata);
static void
keynode_clone(const dns_rdataset_t *source,
        dns_rdataset_t *target DNS__DB_FLARG);

static dns_rdatasetmethods_t methods = {
  .disassociate = keynode_disassociate,
  .first = keynode_first,
  .next = keynode_next,
  .current = keynode_current,
  .clone = keynode_clone,
};

static void
destroy_keynode(dns_keynode_t *knode) {
  isc_rwlock_destroy(&knode->rwlock);
  if (knode->dslist != NULL) {
    ISC_LIST_FOREACH(knode->dslist->rdata, rdata, link) {
      ISC_LIST_UNLINK(knode->dslist->rdata, rdata, link);
      isc_mem_put(knode->mctx, rdata->data,
            DNS_DS_BUFFERSIZE);
      isc_mem_put(knode->mctx, rdata, sizeof(*rdata));
    }

    isc_mem_put(knode->mctx, knode->dslist, sizeof(*knode->dslist));
  }

  dns_name_free(&knode->name, knode->mctx);
  isc_mem_putanddetach(&knode->mctx, knode, sizeof(dns_keynode_t));
}

ISC_REFCOUNT_IMPL(dns_keynode, destroy_keynode);

void
dns_keytable_create(dns_view_t *view, dns_keytable_t **keytablep) {
  dns_keytable_t *keytable = NULL;

  /*
   * Create a keytable.
   */

  REQUIRE(keytablep != NULL && *keytablep == NULL);

  keytable = isc_mem_get(view->mctx, sizeof(*keytable));
  *keytable = (dns_keytable_t){
    .magic = KEYTABLE_MAGIC,
  };

  isc_mem_attach(view->mctx, &keytable->mctx);
  dns_qpmulti_create(view->mctx, &qpmethods, view, &keytable->table);
  isc_refcount_init(&keytable->references, 1);
  *keytablep = keytable;
}

static void
destroy_keytable(dns_keytable_t *keytable) {
  dns_qpread_t qpr;
  dns_qpiter_t iter;
  void *pval = NULL;

  keytable->magic = 0;

  dns_qpmulti_query(keytable->table, &qpr);
  dns_qpiter_init(&qpr, &iter);
  while (dns_qpiter_next(&iter, &pval, NULL) == ISC_R_SUCCESS) {
    dns_keynode_t *n = pval;
    dns_keynode_detach(&n);
  }
  dns_qpread_destroy(keytable->table, &qpr);

  dns_qpmulti_destroy(&keytable->table);

  isc_mem_putanddetach(&keytable->mctx, keytable, sizeof(*keytable));
}

ISC_REFCOUNT_IMPL(dns_keytable, destroy_keytable);

static void
add_ds(dns_keynode_t *knode, dns_rdata_ds_t *ds, isc_mem_t *mctx) {
  isc_result_t result;
  dns_rdata_t *dsrdata = NULL;
  void *data = NULL;
  bool exists = false;
  isc_buffer_t b;

  dsrdata = isc_mem_get(mctx, sizeof(*dsrdata));
  dns_rdata_init(dsrdata);

  data = isc_mem_get(mctx, DNS_DS_BUFFERSIZE);
  isc_buffer_init(&b, data, DNS_DS_BUFFERSIZE);

  result = dns_rdata_fromstruct(dsrdata, dns_rdataclass_in,
              dns_rdatatype_ds, ds, &b);
  RUNTIME_CHECK(result == ISC_R_SUCCESS);

  RWLOCK(&knode->rwlock, isc_rwlocktype_write);

  if (knode->dslist == NULL) {
    knode->dslist = isc_mem_get(mctx, sizeof(*knode->dslist));
    dns_rdatalist_init(knode->dslist);
    knode->dslist->rdclass = dns_rdataclass_in;
    knode->dslist->type = dns_rdatatype_ds;

    INSIST(knode->dsset.methods == NULL);
    knode->dsset.methods = &methods;
    knode->dsset.rdclass = knode->dslist->rdclass;
    knode->dsset.type = knode->dslist->type;
    knode->dsset.covers = knode->dslist->covers;
    knode->dsset.ttl = knode->dslist->ttl;
    knode->dsset.keytable.node = knode;
    knode->dsset.keytable.iter = NULL;
    knode->dsset.trust = dns_trust_ultimate;
  }

  ISC_LIST_FOREACH(knode->dslist->rdata, rdata, link) {
    if (dns_rdata_compare(rdata, dsrdata) == 0) {
      exists = true;
      break;
    }
  }

  if (exists) {
    isc_mem_put(mctx, dsrdata->data, DNS_DS_BUFFERSIZE);
    isc_mem_put(mctx, dsrdata, sizeof(*dsrdata));
  } else {
    ISC_LIST_APPEND(knode->dslist->rdata, dsrdata, link);
  }

  RWUNLOCK(&knode->rwlock, isc_rwlocktype_write);
}

static isc_result_t
delete_ds(dns_qp_t *qp, dns_keytable_t *keytable, dns_keynode_t *knode,
    dns_rdata_ds_t *ds) {
  isc_result_t result;
  dns_rdata_t dsrdata = DNS_RDATA_INIT;
  dns_keynode_t *newnode = NULL;
  unsigned char data[DNS_DS_BUFFERSIZE];
  bool found = false;
  void *pval = NULL;
  isc_buffer_t b;

  RWLOCK(&knode->rwlock, isc_rwlocktype_read);
  if (knode->dslist == NULL) {
    RWUNLOCK(&knode->rwlock, isc_rwlocktype_read);
    return ISC_R_SUCCESS;
  }

  isc_buffer_init(&b, data, DNS_DS_BUFFERSIZE);

  result = dns_rdata_fromstruct(&dsrdata, dns_rdataclass_in,
              dns_rdatatype_ds, ds, &b);
  if (result != ISC_R_SUCCESS) {
    RWUNLOCK(&knode->rwlock, isc_rwlocktype_read);
    return result;
  }

  ISC_LIST_FOREACH(knode->dslist->rdata, rdata, link) {
    if (dns_rdata_compare(rdata, &dsrdata) == 0) {
      found = true;
      break;
    }
  }

  if (!found) {
    RWUNLOCK(&knode->rwlock, isc_rwlocktype_read);
    /*
     * The keyname must have matched or we wouldn't be here,
     * so we use DNS_R_PARTIALMATCH instead of ISC_R_NOTFOUND.
     */
    return DNS_R_PARTIALMATCH;
  }

  /*
   * Replace knode with a new instance without the DS.
   */
  newnode = new_keynode(&knode->name, NULL, keytable, knode->managed,
            knode->initial);
  ISC_LIST_FOREACH(knode->dslist->rdata, rdata, link) {
    if (dns_rdata_compare(rdata, &dsrdata) != 0) {
      dns_rdata_ds_t ds0;
      result = dns_rdata_tostruct(rdata, &ds0, NULL);
      RUNTIME_CHECK(result == ISC_R_SUCCESS);
      add_ds(newnode, &ds0, keytable->mctx);
    }
  }

  result = dns_qp_deletename(qp, &knode->name, DNS_DBNAMESPACE_NORMAL,
           &pval, NULL);
  INSIST(result == ISC_R_SUCCESS);
  INSIST(pval == knode);

  result = dns_qp_insert(qp, newnode, 0);
  RUNTIME_CHECK(result == ISC_R_SUCCESS);

  RWUNLOCK(&knode->rwlock, isc_rwlocktype_read);

  dns_keynode_detach(&knode);
  return ISC_R_SUCCESS;
}

/*%
 * Create a keynode for "ds" (or a null key node if "ds" is NULL), set
 * "managed" and "initial" as requested and attach the keynode to
 * to "node" in "keytable".
 */
static dns_keynode_t *
new_keynode(const dns_name_t *name, dns_rdata_ds_t *ds,
      dns_keytable_t *keytable, bool managed, bool initial) {
  dns_keynode_t *knode = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(!initial || managed);

  knode = isc_mem_get(keytable->mctx, sizeof(dns_keynode_t));
  *knode = (dns_keynode_t){ .name = DNS_NAME_INITEMPTY,
          .magic = KEYNODE_MAGIC };

  dns_rdataset_init(&knode->dsset);
  isc_refcount_init(&knode->references, 1);
  isc_rwlock_init(&knode->rwlock);

  dns_name_dup(name, keytable->mctx, &knode->name);

  /*
   * If a DS was supplied, initialize an rdatalist.
   */
  if (ds != NULL) {
    add_ds(knode, ds, keytable->mctx);
  }

  isc_mem_attach(keytable->mctx, &knode->mctx);
  knode->managed = managed;
  knode->initial = initial;

  return knode;
}

/*%
 * Add key trust anchor "ds" at "keyname" in "keytable".  If an anchor
 * already exists at the requested name does not contain "ds", update it.
 * If "ds" is NULL, add a null key to indicate that "keyname" should be
 * treated as a secure domain without supplying key data which would allow
 * the domain to be validated.
 */
static isc_result_t
insert(dns_keytable_t *keytable, bool managed, bool initial,
       const dns_name_t *keyname, dns_rdata_ds_t *ds,
       dns_keytable_callback_t callback, void *callback_arg) {
  isc_result_t result;
  dns_keynode_t *newnode = NULL;
  dns_qp_t *qp = NULL;
  void *pval = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));

  dns_qpmulti_write(keytable->table, &qp);

  result = dns_qp_getname(qp, keyname, DNS_DBNAMESPACE_NORMAL, &pval,
        NULL);
  if (result != ISC_R_SUCCESS) {
    /*
     * There was no match for "keyname" in "keytable" yet, so one
     * was created.  Create a new key node for the supplied
     * trust anchor (or a null key node if "ds" is NULL)
     * and insert it.
     */
    newnode = new_keynode(keyname, ds, keytable, managed, initial);
    result = dns_qp_insert(qp, newnode, 0);
    if (callback != NULL) {
      (*callback)(keyname, callback_arg);
    }
  } else {
    /*
     * A node already exists for "keyname" in "keytable".
     */
    if (ds != NULL) {
      dns_keynode_t *knode = pval;
      add_ds(knode, ds, keytable->mctx);
    }
    result = ISC_R_SUCCESS;
  }

  dns_qp_compact(qp, DNS_QPGC_MAYBE);
  dns_qpmulti_commit(keytable->table, &qp);

  return result;
}

isc_result_t
dns_keytable_add(dns_keytable_t *keytable, bool managed, bool initial,
     dns_name_t *name, dns_rdata_ds_t *ds,
     dns_keytable_callback_t callback, void *callback_arg) {
  REQUIRE(ds != NULL);
  REQUIRE(!initial || managed);

  return insert(keytable, managed, initial, name, ds, callback,
          callback_arg);
}

isc_result_t
dns_keytable_marksecure(dns_keytable_t *keytable, const dns_name_t *name) {
  return insert(keytable, true, false, name, NULL, NULL, NULL);
}

isc_result_t
dns_keytable_delete(dns_keytable_t *keytable, const dns_name_t *keyname,
        dns_keytable_callback_t callback, void *callback_arg) {
  isc_result_t result;
  dns_qp_t *qp = NULL;
  void *pval = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(keyname != NULL);

  dns_qpmulti_write(keytable->table, &qp);
  result = dns_qp_deletename(qp, keyname, DNS_DBNAMESPACE_NORMAL, &pval,
           NULL);
  if (result == ISC_R_SUCCESS) {
    dns_keynode_t *n = pval;
    if (callback != NULL) {
      (*callback)(keyname, callback_arg);
    }
    dns_keynode_detach(&n);
  }
  dns_qp_compact(qp, DNS_QPGC_MAYBE);
  dns_qpmulti_commit(keytable->table, &qp);

  return result;
}

isc_result_t
dns_keytable_deletekey(dns_keytable_t *keytable, const dns_name_t *keyname,
           dns_rdata_dnskey_t *dnskey) {
  isc_result_t result;
  dns_keynode_t *knode = NULL;
  dns_rdata_t rdata = DNS_RDATA_INIT;
  unsigned char data[DNS_RDATA_MAXLENGTH], digest[DNS_DS_BUFFERSIZE];
  dns_rdata_ds_t ds;
  isc_buffer_t b;
  dns_qp_t *qp = NULL;
  void *pval = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(dnskey != NULL);

  dns_qpmulti_write(keytable->table, &qp);
  result = dns_qp_getname(qp, keyname, DNS_DBNAMESPACE_NORMAL, &pval,
        NULL);
  if (result != ISC_R_SUCCESS) {
    goto finish;
  }

  knode = pval;

  RWLOCK(&knode->rwlock, isc_rwlocktype_read);
  if (knode->dslist == NULL) {
    RWUNLOCK(&knode->rwlock, isc_rwlocktype_read);
    result = DNS_R_PARTIALMATCH;
    goto finish;
  }
  RWUNLOCK(&knode->rwlock, isc_rwlocktype_read);

  isc_buffer_init(&b, data, sizeof(data));
  result = dns_rdata_fromstruct(&rdata, dnskey->common.rdclass,
              dns_rdatatype_dnskey, dnskey, &b);
  if (result != ISC_R_SUCCESS) {
    goto finish;
  }

  result = dns_ds_fromkeyrdata(keyname, &rdata, DNS_DSDIGEST_SHA256,
             digest, sizeof(digest), &ds);
  if (result != ISC_R_SUCCESS) {
    goto finish;
  }

  result = delete_ds(qp, keytable, knode, &ds);

finish:
  dns_qp_compact(qp, DNS_QPGC_MAYBE);
  dns_qpmulti_commit(keytable->table, &qp);

  return result;
}

isc_result_t
dns_keytable_find(dns_keytable_t *keytable, const dns_name_t *keyname,
      dns_keynode_t **keynodep) {
  isc_result_t result;
  dns_qpread_t qpr;
  void *pval = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(keyname != NULL);
  REQUIRE(keynodep != NULL && *keynodep == NULL);

  dns_qpmulti_query(keytable->table, &qpr);
  result = dns_qp_getname(&qpr, keyname, DNS_DBNAMESPACE_NORMAL, &pval,
        NULL);
  if (result == ISC_R_SUCCESS) {
    dns_keynode_t *knode = pval;
    dns_keynode_attach(knode, keynodep);
  }
  dns_qpread_destroy(keytable->table, &qpr);

  return result;
}

isc_result_t
dns_keytable_finddeepestmatch(dns_keytable_t *keytable, const dns_name_t *name,
            dns_name_t *foundname) {
  isc_result_t result;
  dns_qpread_t qpr;
  dns_keynode_t *keynode = NULL;
  void *pval = NULL;

  /*
   * Search for the deepest match in 'keytable'.
   */

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(dns_name_isabsolute(name));
  REQUIRE(foundname != NULL);

  dns_qpmulti_query(keytable->table, &qpr);
  result = dns_qp_lookup(&qpr, name, DNS_DBNAMESPACE_NORMAL, NULL, NULL,
             &pval, NULL);
  keynode = pval;

  if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
    dns_name_copy(&keynode->name, foundname);
    result = ISC_R_SUCCESS;
  }

  dns_qpread_destroy(keytable->table, &qpr);
  return result;
}

bool
dns_keytable_issecuredomain(dns_keytable_t *keytable, const dns_name_t *name,
          dns_name_t *foundname) {
  isc_result_t result;
  dns_qpread_t qpr;
  dns_keynode_t *keynode = NULL;
  void *pval = NULL;
  bool secure = false;

  /*
   * Is 'name' at or beneath a trusted key?
   */

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(dns_name_isabsolute(name));

  dns_qpmulti_query(keytable->table, &qpr);
  result = dns_qp_lookup(&qpr, name, DNS_DBNAMESPACE_NORMAL, NULL, NULL,
             &pval, NULL);
  if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH) {
    keynode = pval;
    if (foundname != NULL) {
      dns_name_copy(&keynode->name, foundname);
    }
    secure = true;
  }

  dns_qpread_destroy(keytable->table, &qpr);

  return secure;
}

static isc_result_t
putstr(isc_buffer_t *b, const char *str) {
  RETERR(isc_buffer_reserve(b, strlen(str)));

  isc_buffer_putstr(b, str);
  return ISC_R_SUCCESS;
}

isc_result_t
dns_keytable_dump(dns_keytable_t *keytable, FILE *fp) {
  isc_result_t result;
  isc_buffer_t *text = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(fp != NULL);

  isc_buffer_allocate(keytable->mctx, &text, 4096);

  result = dns_keytable_totext(keytable, text);

  if (isc_buffer_usedlength(text) != 0) {
    (void)putstr(text, "\n");
  } else if (result == ISC_R_SUCCESS) {
    (void)putstr(text, "none");
  } else {
    (void)putstr(text, "could not dump key table: ");
    (void)putstr(text, isc_result_totext(result));
  }

  fprintf(fp, "%.*s", (int)isc_buffer_usedlength(text),
    (char *)isc_buffer_base(text));

  isc_buffer_free(&text);
  return result;
}

static isc_result_t
keynode_dslist_totext(dns_keynode_t *keynode, isc_buffer_t *text) {
  isc_result_t result;
  char namebuf[DNS_NAME_FORMATSIZE];
  char obuf[DNS_NAME_FORMATSIZE + 200];
  dns_rdataset_t dsset;

  dns_rdataset_init(&dsset);
  if (!dns_keynode_dsset(keynode, &dsset)) {
    return ISC_R_SUCCESS;
  }

  dns_name_format(&keynode->name, namebuf, sizeof(namebuf));

  DNS_RDATASET_FOREACH(&dsset) {
    char algbuf[DNS_SECALG_FORMATSIZE];
    dns_rdata_t rdata = DNS_RDATA_INIT;
    dns_rdata_ds_t ds;

    dns_rdataset_current(&dsset, &rdata);
    result = dns_rdata_tostruct(&rdata, &ds, NULL);
    RUNTIME_CHECK(result == ISC_R_SUCCESS);

    dns_secalg_format(ds.algorithm, algbuf, sizeof(algbuf));

    RWLOCK(&keynode->rwlock, isc_rwlocktype_read);
    snprintf(obuf, sizeof(obuf), "%s/%s/%d ; %s%s\n", namebuf,
       algbuf, ds.key_tag,
       keynode->initial ? "initializing " : "",
       keynode->managed ? "managed" : "static");
    RWUNLOCK(&keynode->rwlock, isc_rwlocktype_read);

    result = putstr(text, obuf);
    if (result != ISC_R_SUCCESS) {
      dns_rdataset_disassociate(&dsset);
      return result;
    }
  }
  dns_rdataset_disassociate(&dsset);

  return ISC_R_SUCCESS;
}

isc_result_t
dns_keytable_totext(dns_keytable_t *keytable, isc_buffer_t *text) {
  isc_result_t result = ISC_R_SUCCESS;
  dns_qpread_t qpr;
  dns_qpiter_t iter;
  void *pval = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));
  REQUIRE(text != NULL);

  dns_qpmulti_query(keytable->table, &qpr);
  dns_qpiter_init(&qpr, &iter);

  while (dns_qpiter_next(&iter, &pval, NULL) == ISC_R_SUCCESS) {
    dns_keynode_t *knode = pval;
    if (knode->dslist != NULL) {
      result = keynode_dslist_totext(knode, text);
      if (result != ISC_R_SUCCESS) {
        break;
      }
    }
  }

  dns_qpread_destroy(keytable->table, &qpr);
  return result;
}

void
dns_keytable_forall(dns_keytable_t *keytable,
        void (*func)(dns_keytable_t *, dns_keynode_t *,
         dns_name_t *, void *),
        void *arg) {
  dns_qpread_t qpr;
  dns_qpiter_t iter;
  void *pval = NULL;

  REQUIRE(VALID_KEYTABLE(keytable));

  dns_qpmulti_query(keytable->table, &qpr);
  dns_qpiter_init(&qpr, &iter);

  while (dns_qpiter_next(&iter, &pval, NULL) == ISC_R_SUCCESS) {
    dns_keynode_t *knode = pval;
    (*func)(keytable, knode, &knode->name, arg);
  }

  dns_qpread_destroy(keytable->table, &qpr);
}

bool
dns_keynode_dsset(dns_keynode_t *keynode, dns_rdataset_t *rdataset) {
  bool result;

  REQUIRE(VALID_KEYNODE(keynode));
  REQUIRE(rdataset == NULL || DNS_RDATASET_VALID(rdataset));

  RWLOCK(&keynode->rwlock, isc_rwlocktype_read);
  if (keynode->dslist != NULL) {
    if (rdataset != NULL) {
      keynode_clone(&keynode->dsset,
              rdataset DNS__DB_FILELINE);
    }
    result = true;
  } else {
    result = false;
  }
  RWUNLOCK(&keynode->rwlock, isc_rwlocktype_read);
  return result;
}

bool
dns_keynode_managed(dns_keynode_t *keynode) {
  bool managed;

  REQUIRE(VALID_KEYNODE(keynode));

  RWLOCK(&keynode->rwlock, isc_rwlocktype_read);
  managed = keynode->managed;
  RWUNLOCK(&keynode->rwlock, isc_rwlocktype_read);

  return managed;
}

bool
dns_keynode_initial(dns_keynode_t *keynode) {
  bool initial;

  REQUIRE(VALID_KEYNODE(keynode));

  RWLOCK(&keynode->rwlock, isc_rwlocktype_read);
  initial = keynode->initial;
  RWUNLOCK(&keynode->rwlock, isc_rwlocktype_read);

  return initial;
}

void
dns_keynode_trust(dns_keynode_t *keynode) {
  REQUIRE(VALID_KEYNODE(keynode));

  RWLOCK(&keynode->rwlock, isc_rwlocktype_write);
  keynode->initial = false;
  RWUNLOCK(&keynode->rwlock, isc_rwlocktype_write);
}

static void
keynode_disassociate(dns_rdataset_t *rdataset DNS__DB_FLARG) {
  dns_keynode_t *keynode = NULL;

  rdataset->methods = NULL;
  keynode = rdataset->keytable.node;
  rdataset->keytable.node = NULL;

  dns_keynode_detach(&keynode);
}

static isc_result_t
keynode_first(dns_rdataset_t *rdataset) {
  dns_keynode_t *keynode = NULL;

  keynode = rdataset->keytable.node;
  RWLOCK(&keynode->rwlock, isc_rwlocktype_read);
  rdataset->keytable.iter = ISC_LIST_HEAD(keynode->dslist->rdata);
  RWUNLOCK(&keynode->rwlock, isc_rwlocktype_read);

  if (rdataset->keytable.iter == NULL) {
    return ISC_R_NOMORE;
  }

  return ISC_R_SUCCESS;
}

static isc_result_t
keynode_next(dns_rdataset_t *rdataset) {
  dns_keynode_t *keynode = NULL;
  dns_rdata_t *rdata = NULL;

  rdata = rdataset->keytable.iter;
  if (rdata == NULL) {
    return ISC_R_NOMORE;
  }

  keynode = rdataset->keytable.node;
  RWLOCK(&keynode->rwlock, isc_rwlocktype_read);
  rdataset->keytable.iter = ISC_LIST_NEXT(rdata, link);
  RWUNLOCK(&keynode->rwlock, isc_rwlocktype_read);

  if (rdataset->keytable.iter == NULL) {
    return ISC_R_NOMORE;
  }

  return ISC_R_SUCCESS;
}

static void
keynode_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
  dns_rdata_t *list_rdata = NULL;

  list_rdata = rdataset->keytable.iter;
  INSIST(list_rdata != NULL);

  dns_rdata_clone(list_rdata, rdata);
}

static void
keynode_clone(const dns_rdataset_t *source,
        dns_rdataset_t *target DNS__DB_FLARG) {
  dns_keynode_t *keynode = NULL;

  keynode = source->keytable.node;
  isc_refcount_increment(&keynode->references);

  *target = *source;
  target->keytable.iter = NULL;
}

static void
qp_attach(void *uctx ISC_ATTR_UNUSED, void *pval,
    uint32_t ival ISC_ATTR_UNUSED) {
  dns_keynode_t *keynode = pval;
  dns_keynode_ref(keynode);
}

static void
qp_detach(void *uctx ISC_ATTR_UNUSED, void *pval,
    uint32_t ival ISC_ATTR_UNUSED) {
  dns_keynode_t *keynode = pval;
  dns_keynode_detach(&keynode);
}

static size_t
qp_makekey(dns_qpkey_t key, void *uctx ISC_ATTR_UNUSED, void *pval,
     uint32_t ival ISC_ATTR_UNUSED) {
  dns_keynode_t *keynode = pval;
  return dns_qpkey_fromname(key, &keynode->name, DNS_DBNAMESPACE_NORMAL);
}

static void
qp_triename(void *uctx, char *buf, size_t size) {
  dns_view_t *view = uctx;
  snprintf(buf, size, "view %s secroots table", view->name);
}

Coverage Report

Created: 2026-08-13 07:07